[BUGFIX] Fix PSR-7 request is missing in CLI context

[sat-hub]

This fixes issue #54. I took the patch by @stigfaerch for 8.2.2 and applied it to the master branch.

[sat-hub]

Correction: The patch is originally made by @TimWilms, see #56.

[stigfaerch]

@sat-hub
When comparing your patch with the on made by @TimWilms, there is many more changes in the one of Tims:
8.2.2...TimWilms:jumpurl:8.2.2-fix
Any idea what that is all about?

[sat-hub]

Of course - these are just additional whitespaces because he added an additional if-then, which increases the indentation of many lines.
I thought that this is quite unnecessary and made the diff much larger than it must be, so I changed the additional if to a boolean condition $isFrontendRequest and added it to the existing if, which results in only one additional line of code and one changed line of code - much shorter.