rna function api was overwriting useful errors with keyword errors.

fix some missing checks in the python interface.

release/ui/buttons_data_mesh.py

@@ -102,6 +102,7 @@ class DATA_PT_shape_keys(DataButtonsPanel):
 		kb = ob.active_shape_key
 
 		row = layout.row()
+		if key: # XXX - looks crappy
 			row.template_list(key, "keys", ob, "active_shape_key_index", rows=2)
 
 		col = row.column()

release/ui/buttons_material.py

@@ -66,6 +66,7 @@ class MATERIAL_PT_context_material(MaterialButtonsPanel):
 			split.template_ID(space, "pin_id")
 			split.itemS()
 		
+		if mat:
 			layout.itemR(mat, "type", expand=True)
 	
 class MATERIAL_PT_shading(MaterialButtonsPanel):

source/blender/python/intern/bpy_rna.c

@@ -1994,8 +1994,10 @@ static PyObject * pyrna_func_call(PyObject * self, PyObject *args, PyObject *kw)
 
 	/* Check if we gave args that dont exist in the function
 	 * printing the error is slow but it should only happen when developing.
-	 * the if below is quick, checking if it passed less keyword args then we gave */
-	if(kw && (PyDict_Size(kw) > kw_tot)) {
+	 * the if below is quick, checking if it passed less keyword args then we gave.
+	 * (Dont overwrite the error if we have one, otherwise can skip important messages and confuse with args)
+	 */
+	if(err == 0 && kw && (PyDict_Size(kw) > kw_tot)) {
 		PyObject *key, *value;
 		Py_ssize_t pos = 0;