fix(legacy): don't log 'could not obtain lock' exception

Fixes #1490

legacy/application/common/TaskManager.php

@@ -64,9 +64,9 @@ public function runTask($taskName)
             $task->run();
         }
         $this->_taskList[$taskName] = true;  // Mark that the task has been checked/run.
-                                             // This is important for prioritized tasks that
-                                             // we need to run on every request (such as the
-                                             // schema check/upgrade)
+        // This is important for prioritized tasks that
+        // we need to run on every request (such as the
+        // schema check/upgrade)
     }
 
     /**
@@ -99,10 +99,14 @@ public function runTasks()
             }
             $this->_updateLock($lock);
             $this->_con->commit();
-        } catch (Exception $e) {
+        } catch (PDOException $e) {
             // We get here if there are simultaneous requests trying to fetch the lock row
             $this->_con->rollBack();
-            Logging::warn($e->getMessage());
+
+            // Do not log could not obtain lock exception:
+            // SQLSTATE[55P03]: Lock not available: 7 ERROR:  could not obtain lock on row in relation "cc_pref"
+            if ($e->getCode() != '55P03') Logging::warn($e->getMessage());
+
 
             return;
         }