Friendly message when command is cancelled

Jonathan Rebourtrequested to merge
fix_friendly_error_for_cancelled_commands into master

Friendly message when command is cancelled

Why:

  • User are shown the Java exception class name when a command is cancelled

This change addresses the need by:

  • Adding a special case for java.utils.concurrent.CancellationException in SiLAErrors.java

This change has the following side effects:

  • none

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