Lexical coverage gate for matching; fix demo false positive

tests/common/mod.rs

@@ -30,6 +30,7 @@ pub fn config_for(dir: &Path, name: &str, relay_url: &str) -> Config {
         index: IndexSection {
             data_dir: dir.join("data").display().to_string(),
         },
+        matching: Default::default(),
     };
     config.save_key(&Keypair::generate()).unwrap();
     config