Tls: Fix empty vector handling in string concatenation functions #85

Job	Run time
check / editor-config	13s
check / clang-checks	1m 37s
build-os-matrix	4s
make-tests (oraclelinux:9) / tests	2m 24s
rpm-build (oraclelinux:9) / rpm-build	5m 29s
build (oraclelinux:9) / build	2m 49s
rpm-install (oraclelinux:9) / rpm-install	1m 9s
	13m 45s

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