render unclosed display block

index.js

@@ -88,23 +88,26 @@ function math_block(state, start, end, silent){
     found = true;
   }
 
-  for(next = start; next < end; ){
-    if(found){ break; }
+  for(next = start; !found; ){
+
     next++;
+
+    if(next >= end){ break; }
+
     pos = state.bMarks[next]+state.tShift[next];
     max = state.eMarks[next];
+
     if(pos < max && state.tShift[next] < state.blkIndent){
+      // non-empty line with negative indent should stop the list:
       break;
     }
+
     if(state.src.slice(pos,max).trim().slice(-2)==='$$'){
       lastPos = state.src.slice(0,max).lastIndexOf('$$');
       lastLine = state.src.slice(pos,lastPos);
       found = true;
     }
-  }
 
-  if(!found){
-    return false;
   }
 
   state.line = next + 1;