Add safe check for Content-Type in photon

[krysal]

Fixes

Follow up to #2086.

Description

This PR check if the "Content-Type" header exists in the the response to the HEAD request for checking the

Testing Instructions

I don't know how to reproduce this error manually but I added a case in the automated tests. Please check that.

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[AetherUnbound]

LGTM!

[zackkrida]

LGTM, this should work.