Fix a case where fts3 was erroneously reporting corruption.

Author: danielk-1977

ext/fts3/fts3_write.c

@@ -4335,27 +4335,26 @@ static int fts3IncrmergeLoad(
           while( reader.aNode && rc==SQLITE_OK ) rc = nodeReaderNext(&reader);
           blobGrowBuffer(&pNode->key, reader.term.n, &rc);
           if( rc==SQLITE_OK ){
-            if( reader.term.n<=0 ){
-              rc = FTS_CORRUPT_VTAB;
-            }else{
+            assert_fts3_nc( reader.term.n>0 || reader.aNode==0 );
+            if( reader.term.n>0 ){
               memcpy(pNode->key.a, reader.term.a, reader.term.n);
-              pNode->key.n = reader.term.n;
-              if( i>0 ){
-                char *aBlock = 0;
-                int nBlock = 0;
-                pNode = &pWriter->aNodeWriter[i-1];
-                pNode->iBlock = reader.iChild;
-                rc = sqlite3Fts3ReadBlock(p, reader.iChild, &aBlock, &nBlock,0);
-                blobGrowBuffer(&pNode->block, 
-                    MAX(nBlock, p->nNodeSize)+FTS3_NODE_PADDING, &rc
-                );
-                if( rc==SQLITE_OK ){
-                  memcpy(pNode->block.a, aBlock, nBlock);
-                  pNode->block.n = nBlock;
-                  memset(&pNode->block.a[nBlock], 0, FTS3_NODE_PADDING);
-                }
-                sqlite3_free(aBlock);
+            }
+            pNode->key.n = reader.term.n;
+            if( i>0 ){
+              char *aBlock = 0;
+              int nBlock = 0;
+              pNode = &pWriter->aNodeWriter[i-1];
+              pNode->iBlock = reader.iChild;
+              rc = sqlite3Fts3ReadBlock(p, reader.iChild, &aBlock, &nBlock,0);
+              blobGrowBuffer(&pNode->block, 
+                  MAX(nBlock, p->nNodeSize)+FTS3_NODE_PADDING, &rc
+                  );
+              if( rc==SQLITE_OK ){
+                memcpy(pNode->block.a, aBlock, nBlock);
+                pNode->block.n = nBlock;
+                memset(&pNode->block.a[nBlock], 0, FTS3_NODE_PADDING);
               }
+              sqlite3_free(aBlock);
             }
           }
         }