The material with 0-density causes errors during writing STEP files

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Author: razmyslovich
Date: Wed Mar 11 10:21:14 2015 +0100

    0025910: properly process 0-density material - create STEP density structures if and only if the density is > 0

The fix is committed, please, review.

I have tried to reproduce the problem in DRAW, but in my test material is just not written, with no error reported:

pload MODELING OCAF XDE
NewDocument D
box b 10 10 10
XSetMaterial D [XAddShape D b] Vacuum 0.
WriteStep D ${imagedir}/bug25910.stp

The problem can be reproduced in Debug. The proposed fix looks Ok, however I believe we need to check why no error is reported in Release mode (I used vc10 x64, OCCT 6.8.0) and ensure that errors of this kind are properly reported.

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Author: razmyslovich
Date: Wed Mar 11 14:29:42 2015 +0100

    0025910: properly process 0-density material - create STEP density structures if and only if the density is > 0, but preserve the already mapped structures

I didn't like the fix myself, therefore I've committed another proposal for the fix. Please, review.

Branch CR25910 is ready to be tested.

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Author: apv
Date: Tue Mar 17 16:25:01 2015 +0300

    Test-case for issue #0025910

Dear Commenter 1,

Branch CR25910 from occt git-repository (and master from products git-repository) was compiled on Linux, MacOS and Windows platforms and tested.
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Number of compiler warnings:
occt component:
   Linux: 18 (18 on master)
   Windows: 0 (0 on master)
products component:
   Linux: 11 (11 on master)
   Windows: 4 (4 on master)

Regressions/Differences:
http://occt-tests/CR25910-master-occt-64/Windows-64-VC10/summary.html
bugs mesh(016) bug25364 (test-case is unstable)

Testing on Linux:
Total MEMORY difference: 89892265 / 90076200
Total CPU difference: 58285.2400000001 / 58911.169999999984

Testing on Windows:
Total MEMORY difference: 58002982 / 58008153
Total CPU difference: 51117.453125 / 57237.046875

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