Merge pull request #3100 from SasView/3014-beta-approximation-does-no…

…t-run

3014: Beta approximation does not run

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

@@ -2940,8 +2940,7 @@ def onMainParamsChange(self, top, bottom):
             # don't try to update multiplicity counters if they aren't there.
             # Note that this will fail for proper bad update where the model
             # doesn't contain multiplicity parameter
-            if self.kernel_module.params.get(parameter_name, None):
-                self.kernel_module.setParam(parameter_name, value)
+            self.kernel_module.setParam(parameter_name, value)
         elif model_column == min_column:
             # min/max to be changed in self.kernel_module.details[parameter_name] = ['Ang', 0.0, inf]
             self.kernel_module.details[parameter_name][1] = value