Issue Summary

Arguments ending with commas added in Docker runner extra arguments text box are replaced with a new line.

This is reproducible on Data Center: Yes

Steps to Reproduce

1. Create a plan with a task
2. Configure the Docker runner extra arguments as in the example below

   mount type=volume,source=my_volume,target=/path/in/container,volume-driver=local,volume-opt=type=tmpfs,volume-opt=device=tmpfs,volume-opt=o=size=100m,to
   

Expected Results

After saving the configuration and running the build, the extra argument should be applied.

Actual Results

Any comma was added in the extra argument will be replaced by a new line

Workaround

The -mount argument can be replaced with the -volume argument