Missing return statements after calls to result in SwiftMsalFlutterPlugin.swift

[lyleresnick]

for example

at line 82, change:

      catch{
        result(FlutterError(code: "NO_ACCOUNT",  message: "Error retrieving an existing account", details: nil))
      }

to

      catch{
        result(FlutterError(code: "NO_ACCOUNT",  message: "Error retrieving an existing account", details: nil))
        return
      }

this code is only run when the keychain is not setup correctly and results in a crash

there are many other calls to result without returns following them