When exception happened, the error message is not wrapped well

[yangte]

simillar problem happens when the server is down and user click 'Buffer' /'Measure', 'Query', 'Redline'..etc. the message is not wrappred well.
steps:

1. Open a flexible web layout in browser
   
2. Wait till the session timeout
   
3. Click 'Buffer' or 'Measure' button in the toolbar
   

result:
the message is not wrapped well. system directly prints the raw data of response. (refer to attachment 'session expired.png')
This is because in the Common.php, when catch the exception, it will output extra error message, just remove the line:
echo "{success: false, message:'".$initializationErrorMessage."'}";