Clean up code: `.str().length()`
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code cleanup
good first issue
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- C++
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Description
Summary:
There are many instances of code that looks like:
if (msg.str().length() > 0)
logger.info(msg);
We should either:
- have the info() method ignore empty messages in general
- wrap the call in a function
Additional Information:
Originally from this PR comment: https://github.com/stan-dev/stan/pull/2570#discussion_r201151286
Current Version:
v2.17.1
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