Improve processing exception (instead of simple 'Empty description' error)

Hello PlantUML team,

• Could you improve processing exception?

Especially when the end tag ‘!endprocedure’ or ‘!endfunction’ is missing;

Instead of the simple ‘Empty description’ error message, could you mention that the end tag is missing.

Simple examples here (where the '!' of the end tag is voluntarily missing):

@startuml
!procedure $msg($source, $destination)
  $source --> $destination
endprocedure

$msg("a", "b")
@enduml

[See on PlantUML server]

or with function:

@startuml
!function $double($a)
!return $a + $a
endfunction

Alice -> Bob : The double of 3 is $double(3)
@enduml

[See on PlantUML server]

Thanks for your support,

Regards,
Th.