JXTextMenuTable: don't fail on empty item text #340

Job	Run time
Build & Package Ubuntu Release	0s
Build & Package MacOS (macos-13)	18m 49s
Build & Package Ubuntu	48m 15s
Build & Package MacOS (macos-14)	10m 11s
Build & Package Fedora	20m 5s
Coverage	6m 26s
Upload releases	0s
Update Homebrew Formulas	0s
Build apps (drakon)	4s
Build apps (glove)	4s
Build apps (jx-ide)	2s
Build apps (leibnitz)	4s
Build apps (ssh-askpass)	1s
Build apps (subversion_client)	3s
Build apps (system-g)	2s
	1h 44m 6s

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