geometry/bypass: fix crash with empty reconstructedDataPath

This commit fixes a null pointer dereference in cases where no
reconstructed point cloud output is specified.

tmc3/PCCTMC3Encoder.h

@@ -240,6 +240,7 @@ class PCCTMC3Encoder3 {
     }
 
     if (params.geometryCodec == GeometryCodecType::kBypass) {
+      if (reconstructedCloud)
         *reconstructedCloud = pointCloud;
     }
     else {