Fix attempts to access plugins/<plugin-name>

The URI here was the same length as the context, thus incrementing
the context by 1 and trying to use that as an index into the URI
was resulting in an index error.

Fixed this way we disallow a plugin from serving content on this
page. If we want to allow it this fix needs to change.

Change-Id: I6c26584f46c8049fe3786018d9a09c1612e6a1c2
1 file changed