"catch" a specific exception type.

--HG--
branch : develop

src/libs/vlayout/vlayoutpiece.cpp

@@ -250,8 +250,9 @@ void VLayoutPiece::SetGrainline(const VGrainlineGeometry& geom, const VContainer
         dLen = cal2.EvalFormula(rPattern.PlainVariables(), qsFormula);
         dLen = ToPixel(dLen, *rPattern.GetPatternUnit());
     }
-    catch(...)
+    catch(qmu::QmuParserError &e)
     {
+        Q_UNUSED(e);
         return;
     }
 

src/libs/vtools/tools/vtoolseamallowance.cpp

@@ -509,8 +509,9 @@ void VToolSeamAllowance::UpdateGrainline()
             Calculator cal2;
             dLength = cal2.EvalFormula(VDataTool::data.PlainVariables(), qsFormula);
         }
-        catch(...)
+        catch(qmu::QmuParserError &e)
         {
+            Q_UNUSED(e);
             m_grainLine->hide();
             return;
         }