Fix a coke oven crash caused by recipes with no fluid output

[antihutka]

Putting a wood pellet into a Railcraft coke oven crashes the server. Add a null check for the recipe's fluid output to fix the issue.

[Dream-Master]

@antihutka you need to run upgrade buildscript. Your build failed

[antihutka]

Done. Updating both buildscript and dependencies was required, and I had to disable checkstyle to get it to build - there are too many .* imports all over the place, that would have to be cleaned up separately.

[Dream-Master]

@antihutka the cleanup can be made with idea as an example.

[antihutka]

Done.