Bugfix when passing empty bytes to detector (#29)

* Bugfix when passing empty seq to detector

* Add test for empty bytes case

* bump version 1.3.2

charset_normalizer/normalizer.py

@@ -348,6 +348,14 @@ def from_bytes(sequences, steps=10, chunk_size=512, threshold=0.20, cp_isolation
         if not explain:
             logger.disable('charset_normalizer')
 
+        if len(sequences) == 0:
+            return CharsetNormalizerMatch(
+                sequences,
+                'utf-8',
+                0.,
+                []
+            )
+
         too_small_sequence = len(sequences) < 24
 
         if too_small_sequence is True:

charset_normalizer/version.py

@@ -2,5 +2,5 @@
 Expose version
 """
 
-__version__ = "1.3.1"
+__version__ = "1.3.2"
 VERSION = __version__.split('.')

test/test_on_byte.py

@@ -10,6 +10,18 @@ def test_too_short_none(self):
             CnM.from_bytes(b'\xfe\xff').best().first()
         )
 
+    def test_empty_bytes(self):
+        r = CnM.from_bytes(b'').best().first()
+
+        self.assertIsNotNone(
+            r
+        )
+
+        self.assertEqual(
+            'utf-8',
+            r.encoding
+        )
+
     def test_bom_detection(self):
         with self.subTest('GB18030 UNAVAILABLE SIG'):
             self.assertFalse(