Add checks on command args to avoid server crashes

init.lua

@@ -287,6 +287,10 @@ local function handle_command(name, param)
 		end
 	elseif action == "player_info" then
 		local player_name = params[2]
+		if not player_name then
+			minetest.chat_send_player(name, S("The player name is nil or empty."))
+			return false
+		end
 		local player_factions = factions.get_player_factions(player_name)
 		if not player_factions then
 			minetest.chat_send_player(name, S("This player doesn't exists or is in no faction"))
@@ -324,6 +328,8 @@ local function handle_command(name, param)
 		local password = params[3]
 		if factions.get_player_faction(name) ~= nil and factions.mode_unique_faction then
 			minetest.chat_send_player(name, S("You are already in a faction."))
+		elseif not faction_name then
+			minetest.chat_send_player(name, S("Missing faction name."))
 		elseif facts[faction_name] == nil then
 			minetest.chat_send_player(name, S("The faction @1 doesn't exist.", faction_name))
 		elseif factions.get_password(faction_name) ~= password then
@@ -487,7 +493,11 @@ local function handle_command(name, param)
 		else
 			local target = params[2]
 			local faction_name = params[3]
-			if facts[faction_name] == nil then
+			if not target then
+				minetest.chat_send_player(name, S("Missing target."))
+			elseif not faction_name then
+				minetest.chat_send_player(name, S("Missing faction name."))
+			elseif facts[faction_name] == nil then
 				minetest.chat_send_player(name, S("The faction @1 doesn't exist.", faction_name))
 			elseif not minetest.player_exists(target) then
 				minetest.chat_send_player(name, S("The player doesn't exist."))

locale/playerfactions.fr.tr

@@ -33,6 +33,7 @@ List available factions=Liste les factions disponibles
 Missing faction name.=Nom de faction manquant.
 Missing password.=Mot de passe manquant.
 Missing player name.=Nom de joueur manquant.
+Missing target.=Nom du joueur cible manquant.
 Name: @1@nOwner: @2@nMembers: @3=Nom : @1@nPropriétaire : @2@nMembres : @3
 Ownership has been transferred to @1.=La propriété a été transférée à @2.
 Password has been updated.=Le mot de passe a été mis à jour.
@@ -56,6 +57,7 @@ The player doesn't exist.=Le joueur n’existe pas.
 The player is already in the faction "@1".=Le joueur est déjà dans la faction "@1". 
 There are no factions yet.=Il n’y a pas encore de factions.
 This faction doesn't exists.=Cette faction n’existe pas.
+The player name is nil or empty.=Le nom du joueur est nul ou vide.
 This player doesn't exists or is in no faction=Ce joueur n’existe pas ou n’est dans aucune faction.
 This player is not in the specified faction.=Le joueur n’est pas dans la faction spécifiée.
 This player is the owner of no faction.=Ce joueur n’est propriétaire d’aucune faction.

locale/template.txt

@@ -33,6 +33,7 @@ List available factions=
 Missing faction name.=
 Missing password.=
 Missing player name.=
+Missing target.=
 Name: @1@nOwner: @2@nMembers: @3=
 Ownership has been transferred to @1.=
 Password has been updated.=
@@ -56,6 +57,7 @@ The player doesn't exist.=
 The player is already in the faction "@1".=
 There are no factions yet.=
 This faction doesn't exists.=
+The player name is nil or empty.=
 This player doesn't exists or is in no faction=
 This player is not in the specified faction.=
 This player is the owner of no faction.=