fix NPE for removed group · Pull Request !7 · makejava/EasyCode

- 在某些情况下如删除分组后再`cancel`的时候，可能导致`currGroupName`还是已删除的分组。
再次打开设置的时候, 将发生`NPE`

- 显示效果如下:
![NPE情况下的显示](https://images.gitee.com/uploads/images/2020/0207/234158_ead70f26_672036.png "屏幕截图.png")

- 错误信息:
```
cannot create configurable component
```

- 堆栈信息:
```log
cannot create configurable component
java.lang.NullPointerException
	at com.sjhy.plugin.ui.TemplateSettingPanel.createComponent(TemplateSettingPanel.java:203)
	at com.intellij.openapi.options.ex.ConfigurableCardPanel.a(ConfigurableCardPanel.java:73)
	at com.intellij.openapi.application.ReadAction.compute(ReadAction.java:47)
	at com.intellij.openapi.options.ex.ConfigurableCardPanel.createConfigurableComponent(ConfigurableCardPanel.java:69)
	at com.intellij.openapi.options.ex.ConfigurableCardPanel.create(ConfigurableCardPanel.java:55)
	at com.intellij.openapi.options.newEditor.ConfigurableEditor$1.create(ConfigurableEditor.java:70)
	at com.intellij.openapi.options.newEditor.ConfigurableEditor$1.create(ConfigurableEditor.java:67)
	at com.intellij.ui.CardLayoutPanel.a(CardLayoutPanel.java:88)
	at com.intellij.ui.CardLayoutPanel.b(CardLayoutPanel.java:116)
	at com.intellij.ui.CardLayoutPanel.a(CardLayoutPanel.java:132)
	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.a(LaterInvocator.java:424)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:407)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
	at java.awt.EventQueue.access$500(EventQueue.java:98)
	at java.awt.EventQueue$3.run(EventQueue.java:715)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
	at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:822)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:650)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:366)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:109)
	at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190)
	at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235)
	at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233)
	at java.awt.Dialog.show(Dialog.java:1084)
	at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl$MyDialog.show(DialogWrapperPeerImpl.java:734)
	at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl.show(DialogWrapperPeerImpl.java:456)
	at com.intellij.openapi.ui.DialogWrapper.invokeShow(DialogWrapper.java:1696)
	at com.intellij.openapi.ui.DialogWrapper.show(DialogWrapper.java:1645)
	at com.intellij.openapi.options.newEditor.SettingsDialog.a(SettingsDialog.java:83)
	at com.intellij.openapi.application.TransactionGuardImpl.a(TransactionGuardImpl.java:88)
	at com.intellij.openapi.application.TransactionGuardImpl.submitTransactionAndWait(TransactionGuardImpl.java:153)
	at com.intellij.openapi.options.newEditor.SettingsDialog.show(SettingsDialog.java:83)
	at com.intellij.ide.actions.ShowSettingsUtilImpl.showSettingsDialog(ShowSettingsUtilImpl.java:97)
	at com.intellij.ide.actions.ShowSettingsAction.perform(ShowSettingsAction.java:63)
	at com.intellij.ide.MacOSApplicationProvider$Worker.a(MacOSApplicationProvider.java:118)
	at com.intellij.ide.MacOSApplicationProvider$Worker.b(MacOSApplicationProvider.java:212)
	at com.intellij.openapi.application.TransactionGuardImpl.a(TransactionGuardImpl.java:88)
	at com.intellij.openapi.application.TransactionGuardImpl.c(TransactionGuardImpl.java:74)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.a(LaterInvocator.java:424)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:407)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
	at java.awt.EventQueue.access$500(EventQueue.java:98)
	at java.awt.EventQueue$3.run(EventQueue.java:715)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
	at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:822)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:650)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:366)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
```

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