Use default setuptools-scm value for tag-pattern instead of empty s…

…tring

Closes ofek#67

hatch_vcs/version_source.py

@@ -53,7 +53,9 @@ def construct_setuptools_scm_config(self):
         config = deepcopy(self.config_raw_options)
         config.setdefault('root', self.root)
 
-        config.setdefault('tag_regex', self.config_tag_pattern)
+        # Only set for non-empty strings
+        if self.config_tag_pattern:
+            config.setdefault('tag_regex', self.config_tag_pattern)
 
         # Only set for non-empty strings
         if self.config_fallback_version:

tests/test_version_config.py

@@ -1,6 +1,8 @@
 # SPDX-FileCopyrightText: 2022-present Ofek Lev <oss@ofek.dev>
 #
 # SPDX-License-Identifier: MIT
+import warnings
+
 import pytest
 
 from hatch_vcs.version_source import VCSVersionSource
@@ -20,6 +22,17 @@ def test_not_string(self, new_project_basic):
         with pytest.raises(TypeError, match='option `tag-pattern` must be a string'):
             _ = version_source.config_tag_pattern
 
+    def test_no_tag_pattern(self, new_project_basic):
+        config = {}
+        version_source = VCSVersionSource(new_project_basic, config)
+
+        assert version_source.config_tag_pattern == ''
+
+        # Should not raise any deprecation warnings
+        with warnings.catch_warnings(category=DeprecationWarning):
+            warnings.simplefilter('error')
+            _ = version_source.get_version_data()
+
 
 class TestFallbackVersion:
     def test_correct(self, new_project_basic):