added regression test

Author: oddbookworm

test/test_regression.py

@@ -512,3 +512,14 @@ def test_numpy_int64_as_integer():
         assert_equal(expected, result)
     except ImportError:
         raise skip("")
+
+def test_empty_table_with_colalign():
+    "Regression: empty table with colalign kwarg"
+    table = tabulate([], ["a", "b", "c"], colalign=("center", "left", "left", "center"))
+    expected = "\n".join(
+        [
+            "a    b    c",
+            "---  ---  ---",
+        ]
+    )
+    assert_equal(expected, table)