add warning if total parametric volume is less then 1

6 jobs for master in 5 minutes and 12 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #127805
Linux
clang-c++11

00:03:57

passed #127809
Linux
clang-c++14

00:03:58

passed #127803
Linux
gcc-c++11

00:01:39

passed #127807
Linux
gcc-c++14

00:01:41

passed #127810
Apple
macos-c++11

00:05:11

passed #127811
Apple
macos-c++14

00:02:56