Fix crash in parser

The Until parse node would return True if it reached EOF, which was not
correct and could cause other parse nodes to run past the end of the
token list and crash.

blueprintcompiler/parse_tree.py

@@ -371,6 +371,9 @@ class Until(ParseNode):
 
     def _parse(self, ctx):
         while not self.delimiter.parse(ctx).succeeded():
+            if ctx.is_eof():
+                return False
+
             try:
                 if not self.child.parse(ctx).matched():
                     ctx.skip_unexpected_token()
@@ -378,9 +381,6 @@ class Until(ParseNode):
                 ctx.errors.append(e)
                 ctx.next_token()
 
-            if ctx.is_eof():
-                return True
-
         return True