Fix closeFolderIfOpened

[jhult]

Current behavior

An IllegalStateException will be thrown if the folder is not already open

New behavior?

Only attempt to close the folder if it is open

[codecov[bot]]

Codecov Report

Merging #724 into master will increase coverage by 0.01%. The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #724      +/-   ##
============================================
+ Coverage     64.75%   64.76%   +0.01%     
- Complexity    11391    11395       +4     
============================================
  Files           892      892              
  Lines         45779    45779              
  Branches       7395     7395              
============================================
+ Hits          29642    29648       +6     
+ Misses        13803    13799       -4     
+ Partials       2334     2332       -2

Impacted Files	Coverage Δ	Complexity Δ
...il/src/main/java/jodd/mail/ReceiveMailSession.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...src/main/java/jodd/madvoc/MadvocServletFilter.java	80.64% <0%> (-9.68%)	7% <0%> (ø)
jodd-core/src/main/java/jodd/io/StreamGobbler.java	66.66% <0%> (+2.38%)	5% <0%> (+1%)	:arrow_up:
...ore/src/main/java/jodd/cache/AbstractCacheMap.java	85.18% <0%> (+4.93%)	27% <0%> (+2%)	:arrow_up:
...c/main/java/jodd/exception/UncheckedException.java	38.46% <0%> (+6.15%)	8% <0%> (+1%)	:arrow_up:

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[igr]

Thank you!