Sometimes precheck fails to filter custom platforms

ERROR:gerrit_monitor.py:482(78040): 'NoneType' object has no attribute 'eval' 
Traceback (most recent call last):   
File "/var/lib/coin/tqtc-coin-ci/src/gerrit_monitor.py", line 469, in process_early_warning_event     
configs = await self.getCustomConfigs(integrationRequest, precheck_type, platforms) 
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File "/var/lib/coin/tqtc-coin-ci/src/gerrit_monitor.py", line 394, in getCustomConfigs     
configs = await self.filterCustomPrecheckConfigs(configs, platforms)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   
File "/var/lib/coin/tqtc-coin-ci/src/gerrit_monitor.py", line 362, in filterCustomPrecheckConfigs
     if condition.eval(config):
        ^^^^^^^^^^^^^^ 
AttributeError: 'NoneType' object has no attribute 'eval'