Add check for nyancat mod before registering the award

Fixes #44

awards.lua

@@ -347,19 +347,6 @@ if minetest.get_modpath("default") then
 		}
 	})
 
-	-- Found a Nyan cat!
-	awards.register_achievement("award_nyanfind", {
-		secret = true,
-		title = S("A Cat in a Pop-Tart?!"),
-		description = S("Mine a nyan cat."),
-		icon = "nyancat_front.png",
-		trigger = {
-			type = "dig",
-			node = "default:nyancat",
-			target = 1
-		}
-	})
-
 	-- Mini Miner
 	awards.register_achievement("award_mine2", {
 		title = S("Mini Miner"),
@@ -907,3 +894,18 @@ minetest.after(0, function()
 		},
 	})
 end)
+
+if minetest.get_modpath("nyancat") then
+	-- Found a Nyan cat!
+	awards.register_achievement("award_nyanfind", {
+		secret = true,
+		title = S("A Cat in a Pop-Tart?!"),
+		description = S("Mine a nyan cat."),
+		icon = "nyancat_front.png",
+		trigger = {
+			type = "dig",
+			node = "nyancat:nyancat",
+			target = 1
+		}
+	})
+end

depends.txt

@@ -11,3 +11,4 @@ vessels?
 moreblocks?
 fire?
 flowers?
+nyancat?

gui.lua

@@ -39,10 +39,13 @@ function awards.get_formspec(name, to, sid)
 		local def = awards.registered_awards[item.name]
 
 		if def and def.secret and not item.got then
-			formspec = formspec .. "label[1,2.75;"..minetest.formspec_escape(S("(Secret Award)")).."]"..
+			formspec = formspec .. "label[1,2.75;"..
+					minetest.formspec_escape(S("(Secret Award)")).."]"..
 					"image[1,0;3,3;awards_unknown.png]"
 			if def and def.description then
-				formspec = formspec	.. "textarea[0.25,3.25;4.8,1.7;;"..minetest.formspec_escape(S("Unlock this award to find out what it is."))..";]"
+				formspec = formspec	.. "textarea[0.25,3.25;4.8,1.7;;"..
+						minetest.formspec_escape(
+								S("Unlock this award to find out what it is."))..";]"
 			end
 		else
 			local title = item.name

mod.conf

@@ -2,7 +2,7 @@ name = awards
 title = Achievements
 author = rubenwardy
 description = Adds achievements to Minetest, and an API to register new ones.
-optional_depends = intllib,sfinv,unified_inventory,default,stairs,farming,dye,beds,wool,vessels,moreblocks,fire,flowers
+optional_depends = intllib,sfinv,unified_inventory,default,stairs,farming,dye,beds,wool,vessels,moreblocks,fire,flowers,nyancat
 license = MIT
 forum = https://forum.minetest.net/viewtopic.php?t=4870
 version = 3.0.0