Make setting the Content-Security-Policy header optional so it doesn't break website mode shares

tests/local_onionshare_website_mode_csp_enabled_test.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+import pytest
+import unittest
+
+from .GuiWebsiteTest import GuiWebsiteTest
+
+class LocalWebsiteModeCSPEnabledTest(unittest.TestCase, GuiWebsiteTest):
+    @classmethod
+    def setUpClass(cls):
+        test_settings = {
+            "csp_header_enabled": True,
+        }
+        cls.gui = GuiWebsiteTest.set_up(test_settings)
+
+    @classmethod
+    def tearDownClass(cls):
+        GuiWebsiteTest.tear_down()
+
+    @pytest.mark.gui
+    @pytest.mark.skipif(pytest.__version__ < '2.9', reason="requires newer pytest")
+    def test_gui(self):
+        #self.run_all_common_setup_tests()
+        self.run_all_website_mode_download_tests(False)
+
+if __name__ == "__main__":
+    unittest.main()