fix add-on export hanging forever on compile errors

[grMLEqomlkkU5Eeinz4brIrOVCUCkJuN]

Description

When the exporting hits a compile error, the dash worker throws an error in dash.build(), but this error never gets posted. So the main thread just waits forever and the progress notification is also never cleared. (actual error is swallowed and i think dash.dispose() was never really called, so I moved it in a finally block)

Motivation

#1652

Additional Context

none needed

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[outercloudstudio]

Related to #1640

[outercloudstudio]

Was taking a look at this, I think there's another issue I want to make sure if fixed first which is just the build seemingly failing due to a missing folder which should not be missing.

[grMLEqomlkkU5Eeinz4brIrOVCUCkJuN]

Was taking a look at this, I think there's another issue I want to make sure if fixed first which is just the build seemingly failing due to a missing folder which should not be missing.

Oh mb ill take a look at it, you have any idea what it is? i didn't commit some artifacts as i thought they were generated for linux

[grMLEqomlkkU5Eeinz4brIrOVCUCkJuN]

Was taking a look at this, I think there's another issue I want to make sure if fixed first which is just the build seemingly failing due to a missing folder which should not be missing.

I just retried both the web and the native build and did not run into any issues.

[grMLEqomlkkU5Eeinz4brIrOVCUCkJuN]

oh wait i just realized i misread the comment