BUG: Exception when calling pandas.isnull() with a pandas type object

doc/source/whatsnew/v0.25.1.rst

@@ -89,7 +89,7 @@ Indexing
 Missing
 ^^^^^^^
 
--
+- Fixed bug where object with no data attribute were not being caught (:issue:`27482`)
 -
 -
 

pandas/core/dtypes/missing.py

@@ -128,6 +128,8 @@ def isna(obj):
 
 
 def _isna_new(obj):
+    if isinstance(obj,type):
+        return False
     if is_scalar(obj):
         return libmissing.checknull(obj)
     # hack (for now) because MI registers as ndarray

scripts/tests/test_27482.py

@@ -0,0 +1,19 @@
+import pandas as pd
+import pytest
+import unittest
+
+class TestStringMethods(unittest.TestCase):
+
+	def test1(self):
+		x = pd.Series([1,2,3,4])
+		xt = type(x)
+		assert pd.isnull(xt)==False,"Passed"
+
+	def test2(self):
+		y = pd.DataFrame({"col": [1,2,3,4]})
+		yt = type(y)
+		assert pd.isnull(yt)==False,"Passed"
+
+
+if __name__ == '__main__':
+    unittest.main()