[digitalstrom] Fix StringIndexOutOfBoundsException
#15319
Merged
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Fixes #15318
Reverts #14402
This is a quick fix reintroducing the usage of
org.apache.commons.lang3.StringUtils
.See https://github.com/openhab/openhab-addons/pull/14402/files#diff-df9f8b976479b842550bcc37488539b40345f2ebe59da2a572b1a2728e5b11a8