Skip N/A values from ffmpeg progress

[cromefire]

Successor to #213
Fixes #178

[cromefire]

There you go

[kokorin]

Please, add your name to the list of authors in files you touched.

[cromefire]

Do you have any particular format in mind?

[kokorin]

Please, check existing Apache copyrights: Name Surname would be fine

[cromefire]

Can only provide you with a username, but that should hopefully be fine. Only for the main code or for the tests too? They don't have a copyright comment currently.

[kokorin]

Username should be enough to confirm your agreement with Apache license. Only in production code: sec/java/main

[cromefire]

Done. Also per GitHub ToS the agreement with the repository license is given automatically when submitting the PR.

[kokorin]

Please, fix You have 1 Checkstyle violation. Probably, it's because credits in license message should be on the same line

[kokorin]

I have checked parsing once again and found, that potentially the issue could be fixed in more generic way (for fffmpeg too) in ParseUtil. I would say that it is possible to check not only for null and empty string, but also for N/A string.

Before:

if (value != null && !value.isEmpty()) {

After:

if (value != null && !value.isEmpty() && !"N/A".equals(value)) {

Could you please also check that?

[cromefire]

Done

[kokorin]

thank you!