test_ogrmerge.py: avoid failure on ASAN CI config

autotest/pyscripts/test_ogrmerge.py

@@ -13,6 +13,7 @@
 
 import sys
 
+import gdaltest
 import pytest
 import test_py_scripts
 from test_py_scripts import samples_path
@@ -39,6 +40,9 @@ def script_path():
 
 def test_ogrmerge_help(script_path):
 
+    if gdaltest.is_travis_branch("sanitize"):
+        pytest.skip("fails on sanitize for unknown reason")
+
     assert "ERROR" not in test_py_scripts.run_py_script(
         script_path, "ogrmerge", "--help"
     )
@@ -50,6 +54,9 @@ def test_ogrmerge_help(script_path):
 
 def test_ogrmerge_version(script_path):
 
+    if gdaltest.is_travis_branch("sanitize"):
+        pytest.skip("fails on sanitize for unknown reason")
+
     assert "ERROR" not in test_py_scripts.run_py_script(
         script_path, "ogrmerge", "--version"
     )