Fix (unwanted) python exception in algorithm test

Author: nyalldawson

python/plugins/processing/tests/QgisAlgorithmsTest.py

@@ -49,8 +49,7 @@ def displayName(self):
         return 'testalg'
 
     def processAlgorithm(self, parameters, context, feedback):
-        raise GeoAlgorithmExecutionException(
-            self.tr('Exception while processing'))
+        raise GeoAlgorithmExecutionException('Exception while processing')
         return {}