Internal: Fix script error running LCK08-J #4996

Author: kennethctdmn

CodeCheck/Published Standards/SEI Cert Standards/Java/LCK08-J/check.upy

@@ -202,6 +202,9 @@ def get_line_nodes(node, lines):
     start_line = node.line_begin()
     node_end = node.end_node()
 
+    if not (start_line and node_end):
+        return
+
     while node_end and (start_line <= node_end.line_end()):
         lines.append(start_line)
         start_line += 1