Revert "fix: Return structured errors from GFAL2 storage operations"

This reverts commit d3edd75.

Author: chaen

src/DIRAC/Resources/Storage/GFAL2_StorageBase.py

@@ -230,10 +230,8 @@ def exists(self, path):
         for url in urls:
             try:
                 successful[url] = self.__singleExists(url)
-            except gfal2.GError as e:
-                failed[url] = {"error": repr(e), "errno": e.code}
             except Exception as e:
-                failed[url] = {"error": repr(e), "errno": None}
+                failed[url] = repr(e)
 
         resDict = {"Failed": failed, "Successful": successful}
         return resDict
@@ -638,10 +636,9 @@ def getFileMetadata(self, path):
         for url in urls:
             try:
                 successful[url] = self._getSingleFileMetadata(url)
-            except gfal2.GError as e:
-                failed[url] = {"error": repr(e), "errno": e.code}
+
             except Exception as e:
-                failed[url] = {"error": repr(e), "errno": None}
+                failed[url] = repr(e)
 
         return {"Failed": failed, "Successful": successful}