Merged in NRRPLT-8110-error-about-populations-after-brain-change (pull request #117)

[NRRPLT-8110] Fix the message error when set_brain fails and returns a list of Exceptions

Approved-by: Ugo Albanese
Approved-by: Antoine Detailleur

hbp_nrp_cleserver/hbp_nrp_cleserver/server/ROSCLEServer.py

@@ -644,9 +644,14 @@ class ROSCLEServer(SimulationServer):
             logger.exception(e)
             return_value = [e.message, -1, -1]
         except Exception as e:  # pylint:disable=broad-except
-            logger.exception(e)
+            message = e
+            if e.args:
+                message = e.args[0]
+                if isinstance(e.args[0], list):
+                    message = [ex.message for ex in e.args[0]]
+            logger.exception(message)
             line_no = extract_line_number(sys.exc_info()[2], tmp.name)
-            return_value = ["Error changing neuronal network: " + str(e), line_no, 0]
+            return_value = ["Error changing neuronal network: " + str(message), line_no, 0]
 
         return return_value