Merge pull request #850 from Ali-Huseynov/patch-1

Fixes issue of __str__ raising exception when DecodeUrl is None

Author: vgrem

office365/sharepoint/types/resource_path.py

@@ -44,7 +44,7 @@ def entity_type_name(self):
         return "SP.ResourcePath"
 
     def __str__(self):
-        return self.DecodedUrl
+        return self.DecodedUrl or ""
 
     def __repr__(self):
         return self.DecodedUrl or self.entity_type_name