Bool passed to strpos() in modernizr_requirements()

Deprecated function: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in modernizr_requirements() (line 33 of modernizr/modernizr.install).

At /admin/reports/status, when libraries is enabled but the Modernizr library has not yet been installed the hook_requirements() implementation calls strpos() with a boolean needle instead of a string.

Let's make sure the libraries path is a string before using it as such.