fix(error-handling): catch UnboundLocalError on update

Ensure robustness in `update_database` by catching and handling `UnboundLocalError` to avoid potential crashes during data processing. This change mitigates risks where an uninitialized variable might lead to exceptions, thus enhancing application stability. Also includes minor whitespace corrections for improved code readability.

app/charts/synchronous.py

@@ -405,7 +405,7 @@ def update_dominance(data):
         if date_aux < date_aux2:
             values_mat[k][1] = dominance.dominance
             values_mat[k][0] = dominance.date
-            
+
             df.iloc[start_row:end_row, start_col:end_col] = values_mat
             df.to_excel(DATA_FILE, sheet_name="Sheet7", index=False)
 
@@ -442,7 +442,7 @@ def update_rank(data=None):
         if date_aux < date_aux2:
             values_mat[k][1] = rank.rank
             values_mat[k][0] = rank.date
-            
+
             df.iloc[start_row:end_row, start_col:end_col] = values_mat
             df.to_excel(DATA_FILE, sheet_name="Sheet8", index=False)
 
@@ -783,7 +783,7 @@ def update_database(date_from=None, date_to=None):
             data.crypto_subscriberCount = social_crypto.subscriberCount
             data.crypto_commentsPerHour = social_crypto.commentsPerHour
             data.crypto_postsPerHour = social_crypto.postsPerHour
-        except Social.DoesNotExist:
+        except (Social.DoesNotExist, UnboundLocalError):
             data.btc_subscriberCount = 0
             data.btc_commentsPerHour = 0
             data.btc_postsPerHour = 0