Fixed exeptions for unprocessable *.php files:

[gplanchat]

The whole process breaks when:

• no class is declared in the file
• no namespace declaration is present in the file (eg. src/AppKernel.php on Sf 3.3+)

[gplanchat]

I just seen #34, it's not exactly a duplicate

In conclusion, we definitely need to either:
a. ignore the unprocessable files
b. push a friendly warning message for unprocessable files

And... I don't use it for Akeneo, so projects happens to have non-class/non-namespaced PHP files (and it fixes #41)

[jjanvier]

Hello @gplanchat

I didn't see your PR sorry (I don't know why I'm not notified).

I was thinking about an elegant way to solve this issue. I'll merge your PR so that you can continue to work normally. But for that I need the build to be green ^^
I'll try to find a "better design" later.

Thanks!

[jjanvier]

OK, the build is broken because of a PHPStan update. Let's merge.
Thanks @gplanchat :)