Add error handling for non-numeric cell codes in extract_code function

apps/kpi_analysis/trafic_analysis.py

@@ -41,7 +41,12 @@ class TraficAnalysis:
 ############### PROCESSING ###############
 def extract_code(name):
     name = name.replace(" ", "_") if isinstance(name, str) else None
-    return int(name.split("_")[0]) if name and len(name) >= 10 else None
+    if name and len(name) >= 10:
+        try:
+            return int(name.split("_")[0])
+        except ValueError:
+            return None
+    return None
 
 
 def preprocess_2g(df: pd.DataFrame) -> pd.DataFrame: