如何避免在没有所有字段的ARRAYFORMULA上使用ARRAY_LITERAL？

Question

我构建了一个Google表格，该表格可以通过IMPORTRANGE收集其他几张表格，如下所示：

8月（A9单元格）的链接将在9月通过IMPORTRANGE删除，但是正确地知道该公式只能让我直到7月（因为有可用的信息），但是如何避免自动生成该链接？

在此示例中，我使用的公式是从一月，二月和八月获取数据，这些数据由于没有链接而总是崩溃：

=QUERY(ARRAYFORMULA({IF(A2="","",QUERY(IMPORTRANGE(A2,"Agent Summary!B5:N"),"Select Col1, Col2, Col3, Col4, Col5, Col6, Col7, Col8, Col9, Col10, Col11, Col12, Col13, '"&B2&"', '"&C2&"' Where Col1 is not null label Col1'', Col2'', Col3'', Col4'', Col5'', Col6'', Col7'', Col8'', Col9'', Col10'', Col11'', Col12'', Col13'', '"&B2&"''',  '"&C2&"'''"));IF(A3="","",QUERY(IMPORTRANGE(A3,"Agent Summary!B5:N"),"Select Col1, Col2, Col3, Col4, Col5, Col6, Col7, Col8, Col9, Col10, Col11, Col12, Col13, '"&B3&"', '"&C3&"' Where Col1 is not null label Col1'', Col2'', Col3'', Col4'', Col5'', Col6'', Col7'', Col8'', Col9'', Col10'', Col11'', Col12'', Col13'', '"&B3&"''',  '"&C3&"'''"));IF(A9="","",QUERY(IMPORTRANGE(A9,"Agent Summary!B5:N"),"Select Col1, Col2, Col3, Col4, Col5, Col6, Col7, Col8, Col9, Col10, Col11, Col12, Col13, '"&B9&"', '"&C9&"' Where Col1 is not null label Col1'', Col2'', Col3'', Col4'', Col5'', Col6'', Col7'', Col8'', Col9'', Col10'', Col11'', Col12'', Col13'', '"&B9&"''',  '"&C9&"'''"))}),"Where Col1 is not null")