Fix _done function not dealing with compilation being undefined #4828
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What kind of change does this PR introduce?
#3934 introduced a bug as the title says, this fixes that.
Did you add tests for your changes?
No, any pointer to where add this test too? It seems there are no tests for the watcher handler being called correctly with
err
.Summary
This should land ASAP because currently webpack is broken for errors in some plugins.
Does this PR introduce a breaking change?
No.
Other information
None.