engineer_apple 15e3f15b48 SpriteBank: error check on non existing textureNumber
seen in broken Fonts. unified getFrameNr

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6368 dfc29bdd-3216-0410-991c-e03cc46cb475
2023-03-24 17:09:11 +01:00
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