fixes not handled exception in "task_mesh_gmsh.py"

error = sys.exc_info()[0].strip()
<class 'AttributeError'>: type object 'RuntimeError' has no attribute 'strip'
Furthermore reporting "value" instead of "type" gives more useful error messages

src/Mod/Fem/femtaskpanels/task_mesh_gmsh.py

@@ -203,11 +203,11 @@ class _TaskPanel:
             error = gmsh_mesh.create_mesh()
         except Exception:
             import sys
+            error = sys.exc_info()[1]
             FreeCAD.Console.PrintMessage(
                 "Unexpected error when creating mesh: {}\n"
-                .format(sys.exc_info()[0])
+                .format(error)
             )
-            error = sys.exc_info()[0].strip()
         if error:
             FreeCAD.Console.PrintMessage("Gmsh had warnings ...\n")
             FreeCAD.Console.PrintMessage("{}\n".format(error))

src/Mod/Fem/femtools/ccxtools.py

@@ -380,7 +380,7 @@ class FemToolsCcx(QtCore.QRunnable, QtCore.QObject):
         except Exception:
             FreeCAD.Console.PrintError(
                 "Unexpected error when writing CalculiX input file: {}\n"
-                .format(sys.exc_info()[0])
+                .format(sys.exc_info()[1])
             )
             raise