Print a warning if the function project root can't be found on deploy #3764
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Inform the user that the project root could not be found instead of throwing a generic null value error and suggest a possible cause.
Currently, if no hosts.json exists in the project directory (e.g. because it was accidentally deleted or not commited), the right click -> "Deploy to ..." functionality will just return the cryptic message
Internal error: Expected value to be neither null nor undefined
on the error console.This commit will let the extension show a warning message instead indicating that no project root could be found.