code: def test_misc_blank(self):
      self.assertMarkdownRenders(
          """![Blank]()""", """<p><img alt="Blank" src="" /></p>"""
      )
  
imports: from markdown.test_tools import TestCase
label_desc: Use image node_id 18 for calling the TestAdvancedImages obj's underlying member method code with example usage: obj.test_misc_blank() without return types