block panic when prom returns range vector

[ta924]

Signed-off-by: Tanner Altares [email protected]

This is a PR to address 1636, which keeps flagger from throwing a panic in the event the prom query returns a range vector.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 34.10%. Comparing base (553184b) to head (e5dfbf4). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1637   +/-   ##
=======================================
  Coverage   34.09%   34.10%           
=======================================
  Files         282      282           
  Lines       20554    20556    +2     
=======================================
+ Hits         7008     7010    +2     
  Misses      12616    12616           
  Partials      930      930           

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