Changed all catch types to references for polymorphic exceptions.

src/Mod/Sketcher/App/SketchAnalysis.cpp

@@ -337,7 +337,7 @@ void SketchAnalysis::analyseMissingPointOnPointCoincident(double angleprecision)
                 }
             
             }
-            catch(Base::Exception e) {
+            catch(Base::Exception &e) {
                 Base::Console().Warning("Point-On-Point Coincidence analysis: unable to obtain derivative. Detection ignored.\n");
                 continue;
             }
@@ -782,7 +782,7 @@ int SketchAnalysis::autoconstraint(double precision, double angleprecision, bool
         try {
             makeMissingEquality();
         }
-        catch(Base::RuntimeError e)
+        catch(Base::RuntimeError &e)
         {
             doc->abortTransaction();
             throw;
@@ -805,4 +805,4 @@ int SketchAnalysis::autoconstraint(double precision, double angleprecision, bool
 
 
     return 0;
-}
+}