Android Teacher App crashes during submissions if there are any JSON errors

[truedat101]

A bad Student Client app can submit improperly. This will crash the teacher app:

E/AndroidRuntime(28556): Caused by: java.lang.NumberFormatException: Invalid int: ""
E/AndroidRuntime(28556): at java.lang.Integer.invalidInt(Integer.java:138)
E/AndroidRuntime(28556): at java.lang.Integer.parseInt(Integer.java:359)
E/AndroidRuntime(28556): at java.lang.Integer.parseInt(Integer.java:332)
E/AndroidRuntime(28556): at java.lang.Integer.valueOf(Integer.java:490)
E/AndroidRuntime(28556): at org.smilec.smile.bu.json.QuestionJSONParser.process(QuestionJSONParser.java:55)
E/AndroidRuntime(28556): at org.smilec.smile.bu.BoardManager.processQuestions(BoardManager.java:186)
E/AndroidRuntime(28556): at org.smilec.smile.bu.BoardManager.loadBoard(BoardManager.java:158)
E/AndroidRuntime(28556): at org.smilec.smile.bu.BoardManager.getBoard(BoardManager.java:63)
E/AndroidRuntime(28556): at org.smilec.smile.ui.GeneralActivity.loadBoard(GeneralActivity.java:711)
E/AndroidRuntime(28556): at org.smilec.smile.ui.GeneralActivity.access$1600(GeneralActivity.java:73)
E/AndroidRuntime(28556): at org.smilec.smile.ui.GeneralActivity$UpdateBoardTask.doInBackground(GeneralActivity.java:760)
E/AndroidRuntime(28556): at org.smilec.smile.ui.GeneralActivity$UpdateBoardTask.doInBackground(GeneralActivity.java:754)
E/AndroidRuntime(28556): at android.os.AsyncTask$2.call(AsyncTask.java:287)
E/AndroidRuntime(28556): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
E/AndroidRuntime(28556): ... 3 more

[truedat101]

We will beef up stability in a later release.