make VRT_handling a no-op if no ctx->handling pointer
This is the case for the ctx created for director operations as first introduced with 5536f102 Alternatively, we could always set ctx->handling to some location with the same scope as the ctx, but as we are not inside VCL (and just happen to use the same context for simplicity and reusability of VRT/vmod functions), adding specific handling appears to be the cleaner solution. Fixes #2692
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