Workaround for a bug with nested list elements tightness

lib/lexer_block.js

@@ -145,12 +145,17 @@ LexerBlock.prototype.tokenize = function (state, startLine, endLine) {
       throw new Error('None of rules updated state.line');
     }
 
-    line = state.line;
-
     // set state.tight iff we had an empty line before current tag
     // i.e. latest empty line should not count
     state.tight = !hasEmptyLines;
 
+    // paragraph might "eat" one newline after it in nested lists
+    if (isEmpty(state, state.line - 1)) {
+      hasEmptyLines = true;
+    }
+
+    line = state.line;
+
     if (line < endLine && isEmpty(state, line)) {
       hasEmptyLines = true;
       line++;