[cli]: Importing an empty database just hangs (does nothing)

[prrao87]

I enter the CLI with a new Kùzu database ./test_db. I exported an empty database to a directory ./new. Then, within the same CLI session, I try to import ./new back into ./test_db. I verified that the export worked, and the .cypher files are empty. However, upon import, the CLI just hangs and does nothing (the import never completes).

$ ./kuzu_shell ./test_db                                                                                                                                                                                                           
Opened the database at path: ./test_db in read-write mode.
Enter ":help" for usage hints.
kuzu> EXPORT DATABASE './new';
-----------------------------------
| result                          |
-----------------------------------
| Exported database successfully. |
-----------------------------------
(1 tuple)
(1 column)
Time: 0.07ms (compiling), 0.28ms (executing)
kuzu> IMPORT DATABASE './new';

Expected behaviour

The expectation is that if I import an empty database (i.e., the copy.cypher is empty), the import operation would still complete and my new database would still be empty. Alternatively, we could print out a warning stating that the imported database has nothing in it (because copy.cypher was empty).

[andyfengHKU]

Should be fixed in #3419