refactor(classifier): 🎨 readapt code to its intial structure

move the test on the error_name value as it was before the fix of deduplications

src/logwatcher/classifier.py

@@ -85,8 +85,6 @@ def classify_log_entries(
     logger.info("\tclassification job started.")
     for log_entry in log_entries:
         error_name = _match_n2_pattern(log_entry)
-        if error_name:
-            log_entry.error_name = error_name
 
         if previous_log_entry is not None and _is_duplicate_error(
             previous_log_entry, log_entry
@@ -96,7 +94,8 @@ def classify_log_entries(
             )
             continue
 
-        if log_entry.error_name:
+        if error_name:
+            log_entry.error_name = error_name
             logger.info(
                 f"\t\tError '{error_name}' associated with log entry '{log_entry.error_message}'. This is a n2 log entry"
             )