Fix: Handle undefined direction in alerts

In alerts with the "Filter count changed" condition, the check now
always falls back to checking if the count increased if the "direction"
condition data is not defined.
Without the fix having it undefined could cause a segmentation fault.

src/manage_sql.c

@@ -14322,7 +14322,10 @@ condition_met (task_t task, report_t report, alert_t alert,
                     {
                       /* Same as "increased". */
                       if (cmp >= count)
-                        return 1;
+                        {
+                          free (filter_id);
+                          return 1;
+                        }
                     }
                   else if (((strcasecmp (direction, "changed") == 0)
                             && (abs (cmp) >= count))
@@ -14341,7 +14344,16 @@ condition_met (task_t task, report_t report, alert_t alert,
                   g_debug ("direction: %s", direction);
                   g_debug ("last_count: %i", last_count);
                   g_debug ("second_last_count NULL");
-                  if (((strcasecmp (direction, "changed") == 0)
+                  if (direction == NULL)
+                    {
+                      /* Same as "increased". */
+                      if (last_count > 0)
+                        {
+                          free (filter_id);
+                          return 1;
+                        }
+                    }
+                  else if (((strcasecmp (direction, "changed") == 0)
                        || (strcasecmp (direction, "increased") == 0))
                       && (last_count > 0))
                     {