fix: skip 0 row blocks to dismiss crashing

source/dnode/vnode/src/tsdb/tsdbSnapshot.c

@@ -115,12 +115,19 @@ static int32_t tsdbSnapReadData(STsdbSnapReader* pReader, uint8_t** ppData) {
           TSDBROW row = tsdbRowFromBlockData(&pReader->oBlockData, iRow);
           int64_t version = TSDBROW_VERSION(&row);
 
+          tsdbTrace("vgId:%d, vnode snapshot tsdb read for %s, %" PRId64 "(%" PRId64 " , %" PRId64 ")",
+                    TD_VID(pReader->pTsdb->pVnode), pReader->pTsdb->path, version, pReader->sver, pReader->ever);
+
           if (version < pReader->sver || version > pReader->ever) continue;
 
           code = tBlockDataAppendRow(&pReader->nBlockData, &row, NULL);
           if (code) goto _err;
         }
 
+        if (pReader->nBlockData.nRow <= 0) {
+          continue;
+        }
+
         // org data
         // compress data (todo)
         int32_t size = sizeof(TABLEID) + tPutBlockData(NULL, &pReader->nBlockData);
@@ -808,7 +815,8 @@ static int32_t tsdbSnapWriteTableData(STsdbSnapWriter* pWriter, TABLEID id) {
   if (code) goto _err;
 
 _exit:
-  tsdbDebug("vgId:%d, vnode snapshot tsdb write data impl for %s", TD_VID(pWriter->pTsdb->pVnode), pWriter->pTsdb->path);
+  tsdbDebug("vgId:%d, vnode snapshot tsdb write data impl for %s", TD_VID(pWriter->pTsdb->pVnode),
+            pWriter->pTsdb->path);
   return code;
 
 _err: