fix(gatsby-plugin-manifest): Only reassign start_url if it already exists #21012
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Currently, I'm seeing the following error coming from
gatsby-plugin-manifest
when I'm using only theicon
option:This happens because the
start_url
option is undefined unless set by the user, yet we're passing it as an argument topath.posix.join
, which expects each argument to be a string. This change adds a condition around the line reassigningmanifest.start_url
to make sure it exists first.