fix division by zero when calculating animation duration

[seer-by-sentry]

Fixes CLIENT-1EH. The issue was that: Animation duration calculation divides by zero when Get_Frame_Rate() returns 0.0, causing a fatal crash.

• Added checks for a positive frame rate (frameRate > 0.0f) before calculating animation natural duration (m_naturalDurationInMsec) to prevent division by zero errors.
• If the frame rate is zero or negative, the natural duration is set to 0.0f.
• Applied similar frame rate checks in W3DModelDraw::Set_Animation_Duration before calculating the animation frame rate multiplier.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 8126305

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