JobScheduler throw exception when reconvert existed video.

[EverettSummer]

Looks like the check condition failed due to an exception.
{"level":50,"time":"2023-02-17T07:42:07.622Z","err":{"type":"TypeError","message":"Cannot read properties of null (reading 'track')","stack":"TypeError: Cannot read properties of null (reading 'track')\n at getStreamsInfo (/app/dist/utils/VideoProber.js:56:25)\n at runMicrotasks (<anonymous>)\n at processTicksAndRejections (node:internal/process/task_queues:96:5)\n at async ConditionParser.getVideoInfo (/app/dist/utils/ConditionParser.js:99:28)\n at async ConditionParser.evaluate (/app/dist/utils/ConditionParser.js:93:9)\n at async JobScheduler.checkConditionMatch (/app/dist/JobScheduler.js:161:20)\n at async JobScheduler.onDownloadMessage (/app/dist/JobScheduler.js:108:29)\n at async /app/dist/JobScheduler.js:51:17\n at async SubscriberSession.<anonymous> (/app/node_modules/@irohalab/mira-shared/services/RascalImpl.js:79:21)"},"msg":"Cannot read properties of null (reading 'track')"}