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Prevent SIGFPE on entity tile loading issue. (#5178)

While experimenting with entities I ran into this unresolvable
error where the server is sending some texture that the client
crashes on. The crash prevents the client from ever reconnecting,
resulting in a server that has to use clearobjects.

We shouldn't crash but just ignore the object and move on.

```
0x00000000004dc0de in TextureSource::generateImagePart (this=this@entry=0x7118eb0, part_of_name="[applyfiltersformesh",
    baseimg=@0x7fffffffbe98: 0x9f1b010) at /home/sofar/git/minetest/src/client/tile.cpp:1744
    1744					u32 xscale = scaleto / dim.Width;
    (gdb) bt
    #0  0x00000000004dc0de in TextureSource::generateImagePart (this=this@entry=0x7118eb0, part_of_name="[applyfiltersformesh",
        baseimg=@0x7fffffffbe98: 0x9f1b010) at /home/sofar/git/minetest/src/client/tile.cpp:1744
```

After reconnecting, the client now can connect without issues
and displays an error message:

```
ERROR[Main]: generateImagePart(): Illegal 0 dimension for part_of_name="[applyfiltersformesh", cancelling.
ERROR[Main]: generateImage(): Failed to generate "[applyfiltersformesh"
ERROR[Main]: Irrlicht: Invalid size of image for OpenGL Texture.
```
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sofar committed Feb 6, 2017
1 parent 80c7527 commit 3e30731c1ac313b504ff15eb7f40ce6a387d3da2
Showing with 6 additions and 0 deletions.
  1. +6 −0 src/client/tile.cpp
@@ -1741,6 +1741,12 @@ bool TextureSource::generateImagePart(std::string part_of_name,
* equal to the target minimum. If e.g. this is a vertical frames
* animation, the short dimension will be the real size.
*/
if ((dim.Width == 0) || (dim.Height == 0)) {
errorstream << "generateImagePart(): Illegal 0 dimension "
<< "for part_of_name=\""<< part_of_name
<< "\", cancelling." << std::endl;
return false;
}
u32 xscale = scaleto / dim.Width;
u32 yscale = scaleto / dim.Height;
u32 scale = (xscale > yscale) ? xscale : yscale;

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