Merge pull request #30417 from mantidproject/30415_disable_fit_in_browser_if_no_valid_function

Check if fit should be enabled after functions removed from fit browser

docs/source/release/v6.0.0/mantidworkbench.rst

@@ -70,5 +70,6 @@ Bugfixes
 - Fixed a crash in SliceViewer when hovering the cursor over Direct or Indirect data.
 - Fixed a crash when using broken e notation for axis limits in plot settings
 - Fixed a bug in error bars tab in plot settings where the Error Every property was not being shown correctly
+- Fixed a bug where the fit action (Fit > Fit) in the fit browser wasn't disabled if all the functions were individually removed.
 
 :ref:`Release 6.0.0 <v6.0.0>`

qt/widgets/common/src/PropertyHandler.cpp

@@ -465,6 +465,7 @@ void PropertyHandler::removeFunction() {
       }
     }
     ph->renameChildren();
+    m_browser->setFitEnabled(cf->nFunctions() > 0);
   }
 }