Display a useful warning message and return HTTP 404 when dependency not found #81
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Following on comments from @KPhans, this PR proposes to
warning
message if a filename from therequest$url
object is not located in thepackage_map
; this implies that the dependency requested could not be foundwarning
Previously, unmatched dependencies would trigger a cryptic
'package' must be of length 1
error, which was not helpful for end users or developers attempting to debug such errors.Closes #79.