Add checks

Author: aurorarossi

docs/make-multi.jl

@@ -65,6 +65,8 @@ has_outbranch = true
 if !success(`git checkout $outbranch`)
     has_outbranch = false
     if !success(`git switch --orphan $outbranch`)
+        run(`git branch`)
+        run(`git status`)
         @error "Cannot create new orphaned branch $outbranch."
         exit(1)
     end