Merge pull request #4151 from edx/i18n-dont-print-exception-msg-twice

Do not print exception message below stacktrace

AUTHORS

@@ -153,4 +153,5 @@ Muhammad Ammar <mammar@edx.org>
 Abdallah Nassif <abdoosh00@gmail.com>
 Johnny Brown <johnnybrown7@gmail.com>
 Ben McMorran <bmcmorran@edx.org>
-Mat Peterson <mpeterson@edx.org>
\ No newline at end of file
+Mat Peterson <mpeterson@edx.org>
+Tim Babych <tim.babych@gmail.com>
\ No newline at end of file

common/lib/capa/capa/inputtypes.py

@@ -221,7 +221,7 @@ class InputTypeBase(object):
         self.status = state.get('status', 'unanswered')
 
         try:
-            # Pre-parse and propcess all the declared requirements.
+            # Pre-parse and process all the declared requirements.
             self.process_requirements()
 
             # Call subclass "constructor" -- means they don't have to worry about calling

common/lib/xmodule/xmodule/capa_base.py

@@ -249,7 +249,11 @@ class CapaMixin(CapaFields):
                 # e.g. in the CMS
                 msg = u'<p>{msg}</p>'.format(msg=cgi.escape(msg))
                 msg += u'<p><pre>{tb}</pre></p>'.format(
-                    tb=cgi.escape(traceback.format_exc()))
+                    # just the traceback, no message - it is already present above
+                    tb=cgi.escape(
+                        u''.join(['Traceback (most recent call last):\n'] +
+                        traceback.format_tb(sys.exc_info()[2])))
+                    )
                 # create a dummy problem with error message instead of failing
                 problem_text = (u'<problem><text><span class="inline-error">'
                                 u'Problem {url} has an error:</span>{msg}</text></problem>'.format(