Add a better error message for 'dotnet run3' when it is unable to find a RunCommand property.
Add a better error message for 'dotnet run3' when it is unable to find a RunCommand property.

dasMulli/cli,nguerrera/cli,nguerrera/cli,svick/cli,naamunds/cli,ravimeda/cli,blackdwarf/cli,jonsequitur/cli,AbhitejJohn/cli,svick/cli,johnbeisner/cli,ravimeda/cli,AbhitejJohn/cli,nguerrera/cli,jonsequitur/cli,weshaggard/cli,mlorbetske/cli,johnbeisner/cli,jonsequitur/cli,naamunds/cli,weshaggard/cli,svick/cli,weshaggard/cli,EdwardBlair/cli,mlorbetske/cli,livarcocc/cli-1,weshaggard/cli,Faizan2304/cli,naamunds/cli,harshjain2/cli,Faizan2304/cli,jonsequitur/cli,naamunds/cli,blackdwarf/cli,dasMulli/cli,nguerrera/cli,naamunds/cli,johnbeisner/cli,weshaggard/cli,EdwardBlair/cli,ravimeda/cli,mlorbetske/cli,AbhitejJohn/cli,EdwardBlair/cli,blackdwarf/cli,mlorbetske/cli,AbhitejJohn/cli,livarcocc/cli-1,dasMulli/cli,Faizan2304/cli,blackdwarf/cli,livarcocc/cli-1,harshjain2/cli,harshjain2/cli