Merge pull request #1067 from mantidproject/39285_fix_width_problem

Fix for bug in width calculation

Author: SilkeSchomann

src/mslice/widgets/cut/cut.py

@@ -146,6 +146,8 @@ def get_integration_end(self):
         return str(self.lneCutIntegrationEnd.text())
 
     def get_integration_width(self):
+        if self.lneCutIntegrationWidth.text() == "":
+            return None
         return str(self.lneCutIntegrationWidth.text())
 
     def get_intensity_start(self):