[fix] (build index) fix build index coredump (#43246)

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Introduced by #42882

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Related PR: #42882

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    - [ ] Regression test
    - [ ] Unit Test
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#### TEST
- Upgrade the BE first, then use build index, and it will core dump.
- Manual testing shows that it doesn't core dump after the upgrade.
1. Execute ADD INDEX
2. Upgrade BE
3. Execute BUILD INDEX

- Behavior changed:

    - [x] No.
    - [ ] Yes. <!-- Explain the behavior change -->

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be/src/olap/task/index_builder.cpp

@@ -376,8 +376,10 @@ Status IndexBuilder::handle_single_rowset(RowsetMetaSharedPtr output_rowset_meta
                 auto column_name = inverted_index.columns[0];
                 auto column_idx = output_rowset_schema->field_index(column_name);
                 if (column_idx < 0) {
-                    column_idx =
-                            output_rowset_schema->field_index(inverted_index.column_unique_ids[0]);
+                    if (!inverted_index.column_unique_ids.empty()) {
+                        column_idx = output_rowset_schema->field_index(
+                                inverted_index.column_unique_ids[0]);
+                    }
                     if (column_idx < 0) {
                         LOG(WARNING) << "referenced column was missing. "
                                      << "[column=" << column_name