dwrite/tests: Do not assume that fonts have a en-us name.

dlls/dwrite/tests/analyzer.c

@@ -1500,7 +1500,10 @@ static void get_enus_string(IDWriteLocalizedStrings *strings, WCHAR *buff, unsig
 
     hr = IDWriteLocalizedStrings_FindLocaleName(strings, L"en-us", &index, &exists);
     ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
-    ok(exists, "Failed to find locale name %d.\n", exists);
+
+    /* Not all fonts have an en-us name! */
+    if (!exists)
+        index = 0;
 
     hr = IDWriteLocalizedStrings_GetString(strings, index, buff, size);
     ok(hr == S_OK, "Failed to get name string, hr %#x.\n", hr);