BUG: stats: don't emit invalid warnings if moments are infinite
BUG: stats: don't emit invalid warnings if moments are infinite

Silence nan floating point warnings in rv_generic.stats, when
calculating derived values that may be nan if higher moments are
infinite.

endolith/scipy,Eric89GXL/scipy,nmayorov/scipy,endolith/scipy,Eric89GXL/scipy,anntzer/scipy,grlee77/scipy,zerothi/scipy,aeklant/scipy,nmayorov/scipy,mdhaber/scipy,WarrenWeckesser/scipy,e-q/scipy,Stefan-Endres/scipy,rgommers/scipy,lhilt/scipy,aarchiba/scipy,rgommers/scipy,perimosocordiae/scipy,jor-/scipy,rgommers/scipy,jor-/scipy,lhilt/scipy,arokem/scipy,gfyoung/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,zerothi/scipy,gertingold/scipy,ilayn/scipy,aeklant/scipy,andyfaff/scipy,rgommers/scipy,vigna/scipy,scipy/scipy,Stefan-Endres/scipy,Eric89GXL/scipy,e-q/scipy,e-q/scipy,mdhaber/scipy,scipy/scipy,nmayorov/scipy,jamestwebber/scipy,lhilt/scipy,gfyoung/scipy,matthew-brett/scipy,scipy/scipy,vigna/scipy,arokem/scipy,ilayn/scipy,andyfaff/scipy,WarrenWeckesser/scipy,person142/scipy,vigna/scipy,tylerjereddy/scipy,person142/scipy,anntzer/scipy,jamestwebber/scipy,mdhaber/scipy,tylerjereddy/scipy,WarrenWeckesser/scipy,zerothi/scipy,person142/scipy,mdhaber/scipy,Eric89GXL/scipy,jamestwebber/scipy,vigna/scipy,Stefan-Endres/scipy,gertingold/scipy,aarchiba/scipy,aarchiba/scipy,grlee77/scipy,nmayorov/scipy,jamestwebber/scipy,e-q/scipy,gfyoung/scipy,pizzathief/scipy,ilayn/scipy,jor-/scipy,lhilt/scipy,WarrenWeckesser/scipy,andyfaff/scipy,matthew-brett/scipy,aeklant/scipy,vigna/scipy,scipy/scipy,Eric89GXL/scipy,aeklant/scipy,gertingold/scipy,jor-/scipy,anntzer/scipy,scipy/scipy,mdhaber/scipy,grlee77/scipy,grlee77/scipy,aarchiba/scipy,perimosocordiae/scipy,pizzathief/scipy,aarchiba/scipy,nmayorov/scipy,rgommers/scipy,anntzer/scipy,andyfaff/scipy,matthew-brett/scipy,ilayn/scipy,Stefan-Endres/scipy,person142/scipy,matthew-brett/scipy,zerothi/scipy,ilayn/scipy,endolith/scipy,perimosocordiae/scipy,andyfaff/scipy,grlee77/scipy,gertingold/scipy,matthew-brett/scipy,arokem/scipy,jor-/scipy,ilayn/scipy,pizzathief/scipy,arokem/scipy,anntzer/scipy,zerothi/scipy,endolith/scipy,perimosocordiae/scipy,zerothi/scipy,arokem/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,gfyoung/scipy,tylerjereddy/scipy,endolith/scipy,tylerjereddy/scipy,pizzathief/scipy,gfyoung/scipy,e-q/scipy,WarrenWeckesser/scipy,mdhaber/scipy,anntzer/scipy,andyfaff/scipy,scipy/scipy,person142/scipy,jamestwebber/scipy,aeklant/scipy,lhilt/scipy,tylerjereddy/scipy,pizzathief/scipy,Eric89GXL/scipy,gertingold/scipy,endolith/scipy,perimosocordiae/scipy