[WPF] Fix application crash when storage file was deleted while app is being active. #897
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If by some reason persistent storage file was deleted while application is running, next time when CodePush tries to access it it crashes with the following exception:
System.IO.FileNotFoundException: Could not find file 'C:\Users\USER_NAME\AppData\Local\PATH_TO_APP\CodePush\CodePush'.
The fix is, if file was deleted - recreate the storage file. Of course all settings will be lost when file was deleted.