Guard against null tensor

Author: lantiga

src/redisai.c

@@ -884,7 +884,9 @@ int RedisAI_Run_Reply(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
     RAI_Tensor *t = NULL;
     if (rinfo->mctx) {
       t = RAI_ModelRunCtxOutputTensor(rinfo->mctx, i);
-      batch_size = RAI_TensorDim(t, 0);
+      if (t && batch_size == 0) {
+        batch_size = RAI_TensorDim(t, 0);
+      }
     }
     else if (rinfo->sctx) {
       t = RAI_ScriptRunCtxOutputTensor(rinfo->sctx, i);