all-your-base: improve "input base is one" test
all-your-base: improve "input base is one" test

the previous version was not properly testing that input base was validated
passing the "empty list" test would also pass this test

rpottsoh/x-common,petertseng/x-common,exercism/x-common,petertseng/x-common,ErikSchierboom/x-common,exercism/x-common,jmluy/x-common,ErikSchierboom/x-common,jmluy/x-common,jmluy/x-common,rpottsoh/x-common