[seer-by-sentry]

Fixes CLIENT-1RQ. The issue was that: Map stream read failure causes a null pointer to be dereferenced during subsequent data parsing.

• Modified RAMFile::readEntireAndClose to return NULL and call close() if m_data is unexpectedly NULL, correctly signaling a read failure instead of returning a dummy buffer.
• Updated DataChunk::load in Generals and GeneralsMD to check for a NULL return value from readEntireAndClose.
• If readEntireAndClose fails, DataChunk::load now sets the size to 0 and returns false, ensuring proper failure propagation.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 8190457

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