Fix the lost wife dream when using no shaders

git-svn-id: http://svn.net-core.org/repos/t-engine4@5543 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/zones/dreams/zone.lua

@@ -181,7 +181,7 @@ return {
 				level.back_shader = require("engine.Shader").new("funky_bubbles", {})
 			end,
 			background = function(level, x, y, nb_keyframes)
-				if not level.back_shader then return end
+				if not level.back_shader or not level.back_shader.shad then return end
 				local sx, sy = level.map._map:getScroll()
 				local mapcoords = {(-sx + level.map.mx * level.map.tile_w) / level.map.viewport.width , (-sy + level.map.my * level.map.tile_h) / level.map.viewport.height}
 				level.back_shader:setUniform("xy", mapcoords)

game/modules/tome/dialogs/LevelupDialog.lua

@@ -73,10 +73,12 @@ function _M:init(actor, on_finish, on_birth)
 
 	self.key:addCommands{
 		__TEXTINPUT = function(c)
-			if c == "+" and self.focus_ui and self.focus_ui.ui.onUse then
-				self.focus_ui.ui:onUse(self.focus_ui.ui.last_mz.item, true)
-			elseif c == "-" then
-				self.focus_ui.ui:onUse(self.focus_ui.ui.last_mz.item, false)
+			if self.focus_ui.ui.last_mz then
+				if c == "+" and self.focus_ui and self.focus_ui.ui.onUse then
+					self.focus_ui.ui:onUse(self.focus_ui.ui.last_mz.item, true)
+				elseif c == "-" then
+					self.focus_ui.ui:onUse(self.focus_ui.ui.last_mz.item, false)
+				end
 			end
 		end,
 	}