Fix PHP warnings in docker (Complement of #2316)

[rdwebdesign]

What does this PR aim to accomplish?:

Fix "undefined variable" PHP warnings in docker.
#2316 fixed the warnings for normal installs, but created warnings in docker.

How does this PR accomplish the above?:

Always adding values for the variables.

What documentation changes (if any) are needed to support this PR?:

none

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[PromoFaux]

I think now with this one needs to add the check as I was with my PR before else the individual component updates will show on a docker container (which is undesirable!)

[rdwebdesign]

I fixed it. Now it should work as expected.

[PromoFaux]

LGTM