fix a bug : random selection of nodes can lead to select twice the same node

13 jobs from master in 66 minutes and 34 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Agrum
passed #62335238
gcc-5 python3 linux
linux_aGrUM_build

00:04:44

passed #62335239
python3 macos
macos_aGrUM_build

00:12:22

passed #62335240
conda windows
windows_aGrUM_build

00:05:25

 
  Pyagrum
passed #62335242
gcc-5 python3 linux
linux_pyAgrum_build

00:05:40

passed #62335243
python3 macos
macos_pyAgrum_build

00:12:24

passed #62335244
conda windows
windows_pyAgrum_build

00:05:25

 
  Agrum Test
passed #62335245
gcc-5 python3 linux
linux_aGrUM_test

00:14:12

passed #62335246
python3 macos
macos_aGrUM_test

00:21:14

passed #62335247
conda windows
windows_aGrUM_test

00:11:44

 
  Pyagrum Test
passed #62335249
gcc-5 python3 linux
linux_pyAgrum_test

00:11:27

passed #62335250
python3 macos
macos_pyAgrum_test

00:13:13

passed #62335251
conda windows
windows_pyAgrum_test

00:05:26

 
  Documentation
passed #62335252
doxygen python3 linux allowed to fail
agrum_master_documentation

00:07:08