Fix PHP warning on admin user search page
When a user is an administrator in one institution, and staff in
another, and performs a search with no results, PHP gives an "Invalid
argument supplied for foreach()" warning.
Change-Id: I3706a639fb11e98cb64c8ef14aede371386e86b4
Signed-off-by:
Richard Mansfield <richard.mansfield@catalyst.net.nz>
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