Apply sensible default values for $CFG if not specified #185
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In order to use the core_component functions, sensible defaults are
required.
These sensible defaults are available, but the check of
$CFG->dirroot
when $CFG is empty lead to a php warning, causing phpcs failures.
Even if this error is fixed, the default values in $CFG are then set to
NULL after including core_component, which means that uses of it work
with null values and cause require errors.
Fixes #184