Fix lsp--suggest-project-root always suggesting something #3972
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This reverts #2112.
The intent of
lsp--suggest-project-root
is not to always return non-nil but instead return nil when no good suggestion is found and let the caller decide what to do in such case. This can be seen in 2 different ways:All calls except in
lsp--calculate-root
(see 2 below) use the following form which demonstrates that the function should sometimes return nil.We find the following snippet in
lsp--calculate-root
which demonstrates that the function should sometimes return nil (otherwiseunless lsp-auto-guess-root
could be removed since always true).