foolproof the fitter against bump's antics

src/sas/qtgui/Perspectives/Fitting/FitThread.py

@@ -13,10 +13,20 @@ def map_getattr(classInstance, classFunc, *args):
     Take an instance of a class and a function name as a string.
     Execute class.function and return result
     """
-    return  getattr(classInstance, classFunc)(*args)
+    try:
+        return_value = getattr(classInstance, classFunc)(*args)
+    except Exception as ex:
+        logger.error("Fitting failed: %s", traceback.format_exc())
+        return None
+    return  return_value
 
 def map_apply(arguments):
-    return arguments[0](*arguments[1:])
+    try:
+        return_value = arguments[0](*arguments[1:])
+    except Exception as ex:
+        logger.error("Fitting failed: %s", traceback.format_exc())
+        return None
+    return return_value
 
 class FitThread(CalcThread):
     """Thread performing the fit """

src/sas/qtgui/Perspectives/Fitting/FittingWidget.py

@@ -2108,9 +2108,11 @@ def fitComplete(self, result):
         #re-enable the Fit button
         self.enableInteractiveElements()
 
-        if len(result) == 0:
+        if result is None or len(result) == 0 or result[0] is None or len(result[0]) == 0 or result[0][0] is None or len(result[0][0]) == 0:
             msg = "Fitting failed."
             self.communicate.statusBarUpdateSignal.emit(msg)
+            # reload the kernel_module in case it's corrupted
+            self.kernel_module = copy.deepcopy(self.kernel_module_copy)
             return
 
         # Don't recalculate chi2 - it's in res.fitness already