Wladimir J. van der Laan 09627b1dd4
Merge #11332: Fix possible crash with invalid nCustomFeeRadio in QSettings (achow101, TheBlueMatt)
cdaf3a1 Fix Qt 0.14.2->0.15.0 segfault if "total at least" is selected (Matt Corallo)

Pull request description:

  `QButtonGroup->button()` may return a nullptr.
  Accessing the object directly with `setChecked` seems fragile.

  This is a simple fix to ensure to never call a button out of bounds (nullptr).

  There are probably other places where a sanity check for `QSettings` are required.

  Found by @achow101.
  Code by @TheBlueMatt.

Tree-SHA512: a1b5d6636382a4e20c4e66ef82de19e6daa8b1b5f21b0f2bc5f51cfb6b37797045c7e29ebead8088ee2b990ed12c549c217cae6aad7566319599d086d526f6dc
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