DBS3Upload crashes during startup in WMAgent 2.1.6
**Impact of the bug**
WMAgent

**Describe the bug**
This PR
https://github.com/dmwm/WMCore/pull/11173

injected a syntax error to the source code, which causes DBS3Upload to crash during startup. See traceback in [1]

**How to reproduce it**
Deploy WMAgent 2.1.6 and start DBS3Upload component

**Expected behavior**
The component needs to successfully startup and perform its expected actions :-)

**Additional context and error message**
[1]
```
Starting : DBS3Upload
Traceback (most recent call last):
  File "/data/srv/wmagent/v2.1.6/sw/slc7_amd64_gcc630/cms/wmagentpy3/2.1.6/bin/wmcoreD", line 348, in <module>
    startup(config)
  File "/data/srv/wmagent/v2.1.6/sw/slc7_amd64_gcc630/cms/wmagentpy3/2.1.6/bin/wmcoreD", line 221, in startup
    componentObject = factory.loadObject(classname = namespace, args = config)
  File "/data/srv/wmagent/v2.1.6/sw/slc7_amd64_gcc630/cms/wmagentpy3/2.1.6/lib/python3.8/site-packages/WMCore/WMFactory.py", line 58, in loadObject
    module = __import__(module, globals(), locals(), [classname])
  File "/data/srv/wmagent/v2.1.6/sw/slc7_amd64_gcc630/cms/wmagentpy3/2.1.6/lib/python3.8/site-packages/WMComponent/DBS3Buffer/DBS3Upload.py", line 23, in <module>
    from WMComponent.DBS3Buffer.DBSUploadPoller import DBSUploadPoller
  File "/data/srv/wmagent/v2.1.6/sw/slc7_amd64_gcc630/cms/wmagentpy3/2.1.6/lib/python3.8/site-packages/WMComponent/DBS3Buffer/DBSUploadPoller.py", line 117
    msg = f"Hit a general exception while inserting block {name. Error: {str(ex}}"
          ^
SyntaxError: f-string: closing parenthesis '}' does not match opening parenthesis '('
```
diff --git a/src/python/WMComponent/DBS3Buffer/DBSUploadPoller.py b/src/python/WMComponent/DBS3Buffer/DBSUploadPoller.py
index 66cebddcd..5b0e2a764 100644
--- a/src/python/WMComponent/DBS3Buffer/DBSUploadPoller.py
+++ b/src/python/WMComponent/DBS3Buffer/DBSUploadPoller.py
@@ -114,7 +114,7 @@ def uploadWorker(workInput, results, dbsUrl, gzipEncoding=False):
                 logging.error(msg)
                 results.put({'name': name, 'success': "error", 'error': msg})
         except Exception as ex:
-            msg = f"Hit a general exception while inserting block {name. Error: {str(ex}}"
+            msg = f"Hit a general exception while inserting block {name}. Error: {str(ex)}"
             logging.exception(msg)
             results.put({'name': name, 'success': "error", 'error': msg})
     return
['src/python/WMComponent/DBS3Buffer/DBSUploadPoller.py']