util: get_bool_cfg(): more debug output

libimagstorestdhook/src/vcs/git/config.rs

@@ -164,7 +164,10 @@ fn get_bool_cfg(cfg: Option<&Value>, name: &str, on_fail: bool, on_unavail: bool
             },
         }
     })
-    .unwrap_or(on_unavail)
+    .unwrap_or_else(|| {
+        debug!("No configuration to fetch {} from, assuming {}", name, on_unavail);
+        on_unavail
+    })
 }
 
 /// Check whether the hook is enabled or not. If the config is not there, the hook is _enabled_ by