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    Problem report 
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    Resolution: Fixed
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    Trivial 
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    4.0.0alpha6
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    None
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        Sprint 35, Sprint 36, Sprint 37
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        0.5
Steps to reproduce:
Create new icon mapping with expression=’@’
Result:
Error message - 'Global regular expression "0" does not exist.'
Expected:
Error message - 'Global regular expression "" does not exist.'