fix(cmd): explicitly set a string representation of the error

[vgonkivs]

json.MarshalIndent cut the result in case of error is received in PrintOutput, so the string representation was empty.

celestia state balance-for-address celestia1kanc76z0xet2kgq5fl3pj59axy56htk367trer --url=https://full.consensus.mocha-4.celestia-mocha.com --node.store=~/.celestia-light-mocha-4
{ "result": "RPC client error: sendRequest failed: Post \"https://full.consensus.mocha-4.celestia-mocha.com\": dial tcp 151.115.12.131:443: connect: connection refused" }

[Wondertan]

utACK

[codecov-commenter]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (b7b6350) 50.88% compared to head (f74111d) 50.92%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
das/daser.go	63.63%	3 Missing and 1 partial ⚠️
das/options.go	0.00%	4 Missing ⚠️
nodebuilder/das/constructors.go	0.00%	2 Missing ⚠️
cmd/util.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2997      +/-   ##
==========================================
+ Coverage   50.88%   50.92%   +0.03%     
==========================================
  Files         168      168              
  Lines       11021    11038      +17     
==========================================
+ Hits         5608     5621      +13     
+ Misses       4915     4914       -1     
- Partials      498      503       +5     

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