Don't call love.graphics functions in love.run until a window has been created, prevents segfaults when love.window and love.graphics were loaded, but there was no window

src/scripts/boot.lua

@@ -494,7 +494,7 @@ function love.run()
 		-- Call update and draw
 		if love.update then love.update(dt) end -- will pass 0 if love.timer is disabled
 
-		if love.window and love.graphics then
+		if love.window and love.graphics and love.window.isCreated() then
 			love.graphics.clear()
 			love.graphics.origin()
 			if love.draw then love.draw() end

src/scripts/boot.lua.h

@@ -871,8 +871,9 @@ const unsigned char boot_lua[] =
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