add warning if total parametric volume is less then 1

6 jobs for master in 5 minutes and 9 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #127595
Linux
clang-c++11

00:03:57

passed #127599
Linux
clang-c++14

00:04:36

passed #127594
Linux
gcc-c++11

00:02:34

passed #127598
Linux
gcc-c++14

00:02:35

passed #127602
Apple
macos-c++11

00:05:08

passed #127604
Apple
macos-c++14

00:02:56