Set default value for batch_size in CNNCreator.ftl since training parameters can be empty.

2 jobs for master in 2 minutes and 51 seconds (queued for 4 minutes and 47 seconds)
Status Job ID Name Coverage
  Windows
passed #168867
Windows10
masterJobWindows

00:01:48

 
  Linux
passed #168868
masterJobLinux

00:01:03