Handle open empty folder

[mbraak]

Handle opening a folder without children. Fixes #858

[github-actions]

Size Change: +11 B (+0.04%)

Total Size: 28.2 kB

Filename	Size	Change
./lib/tree.jquery.js	5.88 kB	+11 B (+0.19%)

ℹ️ View Unchanged

Filename	Size
./lib/dataLoader.js	863 B
./lib/dragAndDropHandler/dragElement.js	432 B
./lib/dragAndDropHandler/generateHitAreas.js	1.2 kB
./lib/dragAndDropHandler/index.js	2.19 kB
./lib/dragAndDropHandler/iterateVisibleNodes.js	547 B
./lib/dragAndDropHandler/types.js	33 B
./lib/elementsRenderer.js	1.86 kB
./lib/jqtreeMethodTypes.js	33 B
./lib/jqtreeOptions.js	33 B
./lib/keyHandler.js	813 B
./lib/mouseHandler.js	1.5 kB
./lib/mouseUtils.js	233 B
./lib/node.js	3.22 kB
./lib/nodeElement/borderDropHint.js	390 B
./lib/nodeElement/folderElement.js	832 B
./lib/nodeElement/ghostDropHint.js	548 B
./lib/nodeElement/index.js	695 B
./lib/nodeUtils.js	192 B
./lib/position.js	382 B
./lib/saveStateHandler.js	1.32 kB
./lib/scrollHandler.js	461 B
./lib/scrollHandler/containerScrollParent.js	871 B
./lib/scrollHandler/createScrollParent.js	512 B
./lib/scrollHandler/documentScrollParent.js	1.06 kB
./lib/scrollHandler/types.js	33 B
./lib/selectNodeHandler.js	622 B
./lib/simple.widget.js	954 B
./lib/util.js	347 B
./lib/version.js	146 B

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.24%. Comparing base (8da7a2e) to head (3cb4d80).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #859   +/-   ##
=======================================
  Coverage   96.24%   96.24%           
=======================================
  Files          30       30           
  Lines        2288     2290    +2     
  Branches      576      577    +1     
=======================================
+ Hits         2202     2204    +2     
  Misses         86       86           

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