Fix crash when creating a project without a proprietary or no license.

zomp/lib/otpr/zx/0.10.4/src/zx_local.erl

@@ -47,7 +47,7 @@
 
 -record(project,
         {type      = none :: none | app | lib | cli | gui | escript,
-         license   = none :: none | none | undefined | string(),
+         license   = none :: none | none | skip | string(),
          name      = none :: none | string(),
          desc      = none :: none | string(),
          repo_url  = none :: none | string(),
@@ -1617,6 +1617,7 @@ substitute(Cooked, []) ->
     unicode:characters_to_binary(Cooked, utf8).
 
 
+license(skip)            -> "";
 license("")              -> "";
 license(Title)           -> "-license(\""++ Title ++ "\").".
 
@@ -2396,7 +2397,7 @@ ask_license() ->
          {"[skip and leave blank]",                         skip}],
     case zx_tty:select(Options) of
         skip ->
-            "";
+            skip;
         proprietary ->
             Notice =
                 "~nNOTE ON PROPRIETARY USE~n"
@@ -2406,7 +2407,7 @@ ask_license() ->
                 "If not (mostly when deploying client-side code that links to ZX or "
                 "other GPL/dual-license libraries), Zomp/ZX should be dual-licensed.~n",
             ok = io:format(Notice),
-            "";
+            skip;
         License ->
             License
     end.