fix: possible crash

[tinted-knight]

Related tasks

Fixes #10 , might also affect #34 , #39 and #51

Changes

• Setting lastResult field to null when success or error message was delivered to prevent calling it more than once, which causes RuntimeException

Troubles (optional)

• Saving Result in class field, waiting for BroadcastReceiver callbacks and using it in onActivityResult looks kind on unstable. Fixing it will probably lead to significant changes in the API.

Note (optional)

• No breaking changes, the purpose is to evade crash, it still will not propagate second received code to Flutter
• Unstable crash on second received code
• Unstable crash on timeout

Checklist for self-check

• Commits and PRs have been filed according to the rules on the project.
• The author is marked as an assignee and assigned mandatory reviewers.
• Required labels marked
• Specified related tasks and/or related PRs.
• Specified Changes.
• Attached videos/screenshots demonstrating the fix/feature.
• All unspecified fields in the PR description deleted.
• New code covered by tests.

Checklist for reviewers

• CI passed successfully (with a green check mark).
• PR is atomic, by volume no more than 400 (+-) corrected lines (not including codegen).

Design:

• System design corresponds to the agreements on structure and architecture on the project.
• The code is decomposed into necessary and sufficient components.

Functionality:

• The code solves the problem.
• Any changes to the user interface are reasonable and look good.

Complexity:

• The code is clear, easy to read, functions are small, no more than 50 lines.
• The logic is not overcomplicated, there is no overengineering (no code sections that may be needed in the future, but no one knows about it).

Tests:

• Updated or added tests for mandatory components.
• The tests are correct, helpful, and well designed/developed.

Naming:

• The naming of variables, methods, classes and other components is understandable.

Comments:

• The comments are understandable and helpful.

Documentation:

• All labels are correct
• Technical documentation updated (after approval, updates last reviewer).

The base branch was changed.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9ee394c) 96.34% compared to head (2895733) 96.34%.

❗ Current head 2895733 differs from pull request most recent head f434c9e. Consider uploading reports for the commit f434c9e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   96.34%   96.34%           
=======================================
  Files           4        4           
  Lines          82       82           
=======================================
  Hits           79       79           
  Misses          3        3           

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