Show ncpu error only if --ncpu is wrong (fix #52).
Show ncpu error only if --ncpu is wrong (fix #52).

Ferada/sigal,elaOnMars/sigal,cbosdo/sigal,muggenhor/sigal,kontza/sigal,jdn06/sigal,cbosdo/sigal,Ferada/sigal,t-animal/sigal,saimn/sigal,kontza/sigal,xouillet/sigal,cbosdo/sigal,jasuarez/sigal,muggenhor/sigal,jdn06/sigal,xouillet/sigal,saimn/sigal,kontza/sigal,jasuarez/sigal,elaOnMars/sigal,t-animal/sigal,jasuarez/sigal,saimn/sigal,Ferada/sigal,t-animal/sigal,jdn06/sigal,franek/sigal,franek/sigal,xouillet/sigal