lsp: Allow for empty base URLs when calculating import paths #13733

Job	Run time
cpp_test_driver (ubuntu-22.04)	5m 27s
cpp_test_driver (macos-12)	7m 6s
node_test (ubuntu-22.04)	3m 49s
build_and_test (ubuntu-22.04, stable)	8m 21s
node_test (macos-11)	5m 3s
cpp_test_driver (windows-2022)	6m 27s
build_and_test (ubuntu-22.04, 1.70)	9m 15s
node_test (windows-2022)	4m 19s
build_and_test (macos-11, stable)	14m 42s
python_test (ubuntu-22.04)	1m 34s
build_and_test (windows-2022, stable)	7m 43s
cpp_cmake (ubuntu-22.04)	6m 25s
python_test (macos-11)	1m 55s
build_and_test (windows-2022, 1.70)	7m 48s
cpp_cmake (macos-12)	22m 43s
python_test (windows-2022)	1m 43s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	7m 38s
cpp_cmake (windows-2022)	8m 9s
ffi_32bit_build	1m 17s
mcu (pico-st7789, thumbv6m-none-eabi)	40s
mcu_esp	2m 38s
mcu (stm32h735g, thumbv7em-none-eabihf)	55s
uefi-demo	42s
android	1m 24s
fmt_test	1m 41s
esp-idf	26m 22s
tree-sitter	11s
updater_test (0.3.0)	1m 19s
docs / docs	2m 46s
wasm_demo / wasm_demo	13m 33s
wasm / wasm	3m 38s
wasm / lint-slintpad	39s
wasm / build-slintpad	49s
cpp_package_test	2m 10s
	3h 10m 51s

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