add test on error in case of not found schemas

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/trunk@1350 b32b6428-25c9-4566-ad07-03861ab6144f

apps/xaal-webui/browser.py

@@ -38,6 +38,8 @@ class App:
     def getSchema(self,devType):
         r=requests.get(self.apiurl+"/api/xaal/schemas/"+devType)
         schema = r.json()
+        if "error" in schema:
+            schema = None
         return schema
 
     def getMetadatadbAddr(self):