fix: error when running format-as is empty` (#219)

* feat: implement word wrapping for formatted output

* fix: fix error when trying to use nil as a map key

---------

Co-authored-by: Guzmán Monné <guzmonne@hotmail.com>

main.go

@@ -254,7 +254,7 @@ func initFlags() {
 		})
 	}
 
-	if config.Format && config.FormatText[config.FormatAs] == "" {
+	if config.Format && config.FormatAs != "" && config.FormatText[config.FormatAs] == "" {
 		config.FormatText[config.FormatAs] = defaultConfig().FormatText[config.FormatAs]
 	}