robustifying database browser agains invalid responses, potentially to illegal requests

orthancDatabaseBrowser.py

@@ -51,7 +51,11 @@ class orthancDB:
         url+='/instances'
         fobj=open (f, 'rb')
         response=self.net.post(url,'octet-stream',fobj.read())
-        encoding=chardet.detect(response.data)["encoding"]
+        try:
+            encoding=chardet.detect(response.data)["encoding"]
+        except AttributeError:
+            print(response)
+            return json.loads('{"status":"BAD"}')
         return json.loads(response.data.decode(encoding))