handle null address for ESDTRoleBurnForAll

[cfaur09]

Reasoning

• Detected an issue where null addresses returned by the vmQuery were not being handled correctly
• Simplified the process of parsing and mapping addresses and roles by separating the logic into a helper function
• Improved code clarity and made error handling more explicit for scenarios where a role is received without a preceding address

Proposed Changes

• Created a processEncodedAddressesAndRoles helper function to streamline the parsing of the encodedData array
• Handled null addresses by setting them as undefined in the TokenRoles object
• Included checks to ensure roles are only processed if they have an associated address or if the address is explicitly set to null/undefined

How to test

• tokens/XBID-c7e360/roles -> should return token roles without errors
• tokens/XBID-c7e360 -> should return token details

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (80cd538) 33.96% compared to head (1ee746e) 33.96%.

Additional details and impacted files

@@             Coverage Diff              @@
##           development    #1136   +/-   ##
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  Coverage        33.96%   33.96%           
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  Files                9        9           
  Lines              315      315           
  Branches            19       19           
============================================
  Hits               107      107           
  Misses             189      189           
  Partials            19       19           

Flag	Coverage Δ
unittests	33.96% <ø> (ø)

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