Changed all catch types to references for polymorphic exceptions.

src/Mod/TechDraw/App/DrawProjectSplit.cpp

@@ -368,7 +368,7 @@ std::vector<TopoDS_Edge> DrawProjectSplit::split1Edge(TopoDS_Edge e, std::vector
                 result.push_back(e1);
             }
         }
-        catch (Standard_Failure) {
+        catch (Standard_Failure&) {
             Base::Console().Message("LOG - DPS::split1Edge failed building edge segment\n");
         }
     }

src/Mod/TechDraw/App/DrawViewSpreadsheet.cpp

@@ -203,7 +203,7 @@ std::string DrawViewSpreadsheet::getSheetImage(void)
                 break;
             }
         }
-    } catch (std::exception) {
+    } catch (std::exception&) {
         Base::Console().Error("Invalid cell range for %s\n",getNameInDocument());
         return result.str();
     }

src/Mod/TechDraw/App/Geometry.cpp

@@ -241,7 +241,7 @@ BaseGeom* BaseGeom::baseFactory(TopoDS_Edge edge)
             }
             break;
         }
-        catch (Standard_Failure) {
+        catch (Standard_Failure&) {
             if (bspline != nullptr) {
                 delete bspline;
                 bspline = nullptr;