Users cannot sign ready-to-execute transactions in transaction group details

[jbair06]

Description:
Related to #2357, there are additional cases where a user is unable to sign a transaction when it is in the ready to execute state. This was observed in the transaction group details view.

The user also reported being unable to open the details for these transactions. The UI should allow users to access the transaction details and sign the transaction even when it is ready to execute.

Expected Behavior:
Users should be able to open transaction details and sign transactions that are in the ready to execute state.

Actual Behavior:
In some cases, transactions in the ready to execute state cannot be signed, and the user cannot get into the details view.

Notes:

• Observed in transaction group details.
• Appears to be another instance of the issue tracked in Cannot sign transactions in WAITING_FOR_EXECUTION status #2357.
• Add tests to cover this behavior and prevent future regressions.