Added exception handling for invalid dbschema.json files

src/Site/SiteStorage.py

@@ -34,8 +34,12 @@ class SiteStorage:
 
     # Load db from dbschema.json
     def openDb(self, check=True):
+        try:
             schema = self.loadJson("dbschema.json")
             db_path = self.getPath(schema["db_file"])
+        except Exception, err:
+            raise Exception("dbschema.json is not a valid JSON: %s", err)
+
         if check:
             if not os.path.isfile(db_path) or os.path.getsize(db_path) == 0:  # Not exist or null
                 self.rebuildDb()