Fix uncaught exceptions in acquireTokenSilent #7073
Merged
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A recent change to optimize parallel iframed calls resulted in a regression that logged an uncaught exception to the console in the event that a single iframed call was made and failed. This happened because the stored promise rejected and didn't have a catch handler registered because there is not a parallel call dependent on this promise.
This PR resolves this issue by ensuring that the stored promise never rejects but rather resolves with a true/false indicating whether the call succeeded or failed.
Fixes #7052