/trigger gives a false error when no value for objective is set

Steps to reproduce:

1. /scoreboard objectives add testTrigger trigger
2. /trigger testTrigger add 1
   • You get "Invalid trigger name testTrigger" error, although testTrigger already exists. In this case the right message would be "Trigger testTrigger is not enabled"

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Code analysis by Marcono1234 can be found in this comment.