Make missing plugin repo errors more informative

Author: dmytrovoytko

internal/config/plugin_installer.go

@@ -155,12 +155,22 @@ func (pr PluginRepository) Fetch(out io.Writer) PluginPackages {
 		return PluginPackages{}
 	}
 	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		fmt.Fprintf(out, "Skipped: %s\n", pr)
+		fmt.Fprintf(out, " Reason: Server error %d (%s)\n", resp.StatusCode,
+			http.StatusText(resp.StatusCode))
+		return nil
+	}
+
 	decoder := json5.NewDecoder(resp.Body)
 
 	var plugins PluginPackages
 	if err := decoder.Decode(&plugins); err != nil {
-		fmt.Fprintln(out, "Failed to decode repository data:\n", err)
-		return PluginPackages{}
+		fmt.Fprintf(out, "Skipped: %s\n", pr)
+		fmt.Fprintf(out, " Reason: Failed to decode repository data:\n")
+		fmt.Fprintf(out, " %s\n", err)
+		return nil
 	}
 	if len(plugins) > 0 {
 		return PluginPackages{plugins[0]}