Find and replace reference feature(experimental) crashes after indexing dialog

FindInBlueprints->CacheAllBlueprints(FSimpleDelegate::CreateSP(this, &SReplaceNodeReferences::OnSubmitSearchQuery, true), EFiBVersion::FIB_VER_VARIABLE_REFERENCE); 

This leads to crash. Users can bypass this step by just leaving 

OnSubmitSearchQuery(true);

instead of CacheAllBlueprints() and run blueprint indexing manually before running it.

1) Enable Find and Replace Reference feature from editor preferences.

2) Create a new blueprint actor

3) Create 2 integers

4) Add a setter for each integers and wire them after begiplay

5) Open Find and replace reference window from variables tab

6) Set replace target and press Find and Replace All button

Expected: The targets for replace and original reference are changed

Result: Crash

Fix UE-51650

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