Don't try to interpret treepath as hash when path contains no hash-path-separator ('/') (#17272) #32338
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This is a workaround to #17179.
Entering this case when
pathdoes not contain a '/' does not reallymake sense, as that means the tree path is empty, but this case is only
entered for routes that expect a non-empty tree path.
Treepaths like <40-char-dirname>/ will still fail,
but hopefully don't occur that often. A more complete fix that avoids
this case too is outlined in #17185, but too big of a change to backport