drazmyslovich 41e259eb8b 0025910: The material with 0-density causes errors during writing STEP files ...

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

Test-case for issue #25910

2015-03-19 17:08:14 +03:00

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