tx pending indicator check + removeNFT

[sk-enya]

1. tx pending indicator check
2. fix removeNFT button

Issue #446

[codecov-commenter]

Codecov Report

Merging #457 (ef0fba4) into develop (ec95fdf) will not change coverage.
The diff coverage is n/a.

❗ Current head ef0fba4 differs from pull request most recent head 53fd03e. Consider uploading reports for the commit 53fd03e to get more accurate results

@@           Coverage Diff            @@
##           develop     #457   +/-   ##
========================================
  Coverage    72.17%   72.17%           
========================================
  Files           59       59           
  Lines         1826     1826           
  Branches       281      281           
========================================
  Hits          1318     1318           
  Misses         508      508           

Flag	Coverage Δ
contracts	86.72% <ø> (ø)
core-utils	53.79% <ø> (ø)
data-transport-layer	29.47% <ø> (ø)
message-relayer	83.17% <ø> (ø)

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