Improve empty short_message identification#6

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vasrem wants to merge 3 commits intohotschedules:masterfrom vasrem:short_message_ctrl_chars

+71-7

Commits on Aug 12, 2019

Improve empty short_message identification
vasrem
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Commits on Oct 8, 2019

Use strip built-in func instead of custom func
vasrem
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Commits on Oct 18, 2019

Add more tests and remove unused code
vasrem
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