Ensure proper initialization of DefaultContentType in config

config/config.go

@@ -842,6 +842,7 @@ func parseGeneral(cfg GeneralTOML) General {
 	general.ShowBoostedUser = NilDefaultBool(cfg.ShowBoostedUser, def.ShowBoostedUser)
 	general.DynamicTimelineName = NilDefaultBool(cfg.DynamicTimelineName, def.DynamicTimelineName)
 	general.CommandsInNewPane = NilDefaultBool(cfg.CommandsInNewPane, def.CommandsInNewPane)
+	general.DefaultContentType = NilDefaultString(cfg.DefaultContentType, def.DefaultContentType)
 
 	lp := NilDefaultString(cfg.ListPlacement, def.ListPlacement)
 	switch lp {

config/toml.go

@@ -38,7 +38,7 @@ type GeneralTOML struct {
 	ShowBoostedUser     *bool               `toml:"show-boosted-user"`
 	DynamicTimelineName *bool               `toml:"dynamic-timeline-name"`
 	CommandsInNewPane   *bool               `toml:"commands-in-new-pane"`
-	DefaultContentType  string 				`toml:"default-content-type"`
+	DefaultContentType  *string				`toml:"default-content-type"`
 }
 
 type TimelineTOML struct {

config/toml_default.go

@@ -43,6 +43,7 @@ var ConfigDefault = ConfigTOML{
 		TerminalTitle:       ip(0),
 		LeaderKey:           sp(""),
 		LeaderTimeout:       ip64(1000),
+		DefaultContentType:  sp("text/plain"),
 		NotificationsToHide: &[]string{},
 		Timelines: &[]TimelineTOML{
 			{