Fixed coverity issues

169009 Bad use of null-like value
169005 Bad use of null-like value
169003 Bad use of null-like value
169000 Bad use of null-like value
168998 Bad use of null-like value
168996 Structurally dead code

src/Mod/Arch/ArchPanel.py

@@ -448,6 +448,11 @@ class _Panel(ArchComponent.Component):
 
         import Part #, DraftGeomUtils
 
+        layers = []
+        length = 0
+        width = 0
+        thickness = 0
+
         # base tests
         if obj.Base:
             if obj.Base.isDerivedFrom("Part::Feature"):
@@ -473,7 +478,6 @@ class _Panel(ArchComponent.Component):
             elif obj.Base.isDerivedFrom("Part::Feature"):
                 if not obj.Base.Shape.Solids:
                     return
-        layers = []
         if hasattr(obj,"Material"):
             if obj.Material:
                 if hasattr(obj.Material,"Materials"):

src/Mod/Arch/ArchWindow.py

@@ -1445,7 +1445,7 @@ class _ViewProviderWindow(ArchComponent.ViewProviderComponent):
                                     if 'DiffuseColor' in mat.Material:
                                         if "(" in mat.Material['DiffuseColor']:
                                             ccol = tuple([float(f) for f in mat.Material['DiffuseColor'].strip("()").split(",")])
-                                    if 'Transparency' in mat.Material:
+                                    if ccol and ('Transparency' in mat.Material):
                                         ccol = (ccol[0],ccol[1],ccol[2],float(mat.Material['Transparency']))
             if not ccol:
                 typeidx = (i*5)+1