add warning if total parametric volume is less then 1

6 jobs for master in 8 minutes and 12 seconds (queued for 5 seconds)
latest
Status Name Job ID Coverage
  Build
passed clang-c++11 #140966
Linux

00:05:38

passed clang-c++14 #140970
Linux

00:08:10

passed gcc-c++11 #140964
Linux

00:02:25

passed gcc-c++14 #140968
Linux

00:02:13

passed macos-c++11 #140971
Apple

00:02:55

passed macos-c++14 #140972
Apple

00:05:01