Error in log since migrated to V4.4

Yes, 8 blank characters were there. Removed.
=> No more error msg in projeqtor log.
ob_clean commented => No more error in apache log.
I confirm that's all right.

But I suggest you :
a) to use a good text editor (at least one offering an option "remove trailing spaces when save", which avoid these waste blanks). Mine is Komodo Edit – free and available on Windows, Mac & Linux, and which have also a very good real-time syntax checker (and also a completion system) for a lot of programming languages.
b) Standardize all source files with same indent mode, as we found now spaces here, tabs there… Almost text editors allowing to define spacing value for tabs, I suggest to define it on 4 and use exclusively tabs to indent (global replace [4 spaces] by tab does the job. )