Fix bug where white space only paragraphs showed

Author: wooorm

lib/util/wrap.js

@@ -24,20 +24,28 @@ function wrap(nodes) {
 
       queue.push(node)
     } else {
-      if (queue !== undefined) {
-        result.push({type: 'paragraph', children: queue})
-        queue = undefined
-      }
-
+      flush()
       result.push(node)
     }
   }
 
-  if (queue !== undefined) {
-    result.push({type: 'paragraph', children: queue})
-  }
+  flush()
 
   return result
+
+  function flush() {
+    if (queue !== undefined) {
+      if (
+        queue.length !== 1 ||
+        queue[0].type !== 'text' ||
+        (queue[0].value !== ' ' && queue[0].value !== '\n')
+      ) {
+        result.push({type: 'paragraph', children: queue})
+      }
+    }
+
+    queue = undefined
+  }
 }
 
 /* Check if there are non-inline MDAST nodes returned.