close file also works on non file editors (fixes #3439)

src/vs/workbench/parts/files/browser/fileActions.ts

@@ -2032,10 +2032,11 @@ export class CloseFileAction extends Action {
 	}
 
 	public run(): TPromise<any> {
+		let editor = this.editorService.getActiveEditor();
 		let input = this.editorService.getActiveEditorInput();
 		let resource = workbenchEditorCommon.getUntitledOrFileResource(input, true);
 
-		// Only works if we have a file or untitled input
+		// For a file or untitled
 		if (resource) {
 			let model = this.textFileService.getWorkingFilesModel();
 			let entry = model.findEntry(resource);
@@ -2068,6 +2069,11 @@ export class CloseFileAction extends Action {
 			}
 		}
 
+		// Any other editor just closes
+		else if (editor) {
+			this.editorService.closeEditor(editor).done(null, errors.onUnexpectedError);;
+		}
+
 		// Otherwise tell the user
 		else {
 			this.messageService.show(Severity.Info, nls.localize('noFileOpen', "There is currently no file opened to close."));