[trivial] don't break when references cannot be resolved

lib/markdownWriter.js

@@ -83,7 +83,12 @@ function stringifyExamples(examples) {
 function simpletype(prop) {
   const type = prop.type;
   if (prop.$ref!==undefined) {
-    prop.simpletype = prop.$linkVal;
+    if (prop.$linkVal!==undefined) {
+      prop.simpletype = prop.$linkVal;
+    } else {
+      console.log('unresolved reference: ' + prop.$ref);
+      prop.simpletype = 'reference';
+    }
   } else if (prop.enum!==undefined) {
     prop.simpletype = '`enum`';
     if (prop['meta:enum']===undefined) {
@@ -113,9 +118,9 @@ function simpletype(prop) {
       if (innertype.simpletype==='complex') {
         prop.simpletype = '`array`';
       } else {
+        //console.log(prop.title);
         prop.simpletype = innertype.simpletype.replace(/(`)$/, '[]$1');
       }
-      console.log();
     } else {
       prop.simpletype = '`array`';
     }