Enhance stacktrace lines matching

renoir/helpers.py

@@ -27,8 +27,8 @@ def __init__(self, parser_ctx, exc_type, exc_value, tb):
         self.file_path, self.lineno = self.match_template(writer_lineno)
 
     def match_template(self, writer_lineno):
-        element = self.lines[writer_lineno - 1]
         try:
+            element = self.lines[writer_lineno - 1]
             reference = (element[0], element[1])
         except Exception:
             reference = (self.parser_ctx.name, ('<unknown>', 'unknown'))

renoir/parsing/contents.py

@@ -317,7 +317,8 @@ def __render__(self, parser):
 
     def __reference__(self):
         rv = []
-        for element in self.value:
+        stack = self.value if not self._evicted else []
+        for element in stack:
             rv.extend(element.__reference__())
         return rv
 
@@ -333,6 +334,11 @@ def __render__(self, parser):
         v = to_unicode(self.render_value())
         return f'\n{parser.writer}.{self._writer_method}({v})' if v else ''
 
+    def __reference__(self):
+        if not to_unicode(self.render_value()):
+            return []
+        return super().__reference__()
+
 
 class PlainNode(WriterNode):
     __slots__ = ['value', 'indent', 'source', 'lines']