fix(timeframe): handle an error due to an invalid timeframe string

[dakimura]

WHAT

• fix a possible panic that occurs when invalid timeframe string is specified in the query/write request (e.g. when queried FOO/BAR/1Min/OHLCV , marketstore was panicking)

WHY

• bugfix

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #584 (af12b62) into master (4765454) will decrease coverage by 0.04%. The diff coverage is 45.00%.

@@            Coverage Diff             @@
##           master     #584      +/-   ##
==========================================
- Coverage   48.92%   48.88%   -0.05%     
==========================================
  Files         138      138              
  Lines       12875    12886      +11     
==========================================
  Hits         6299     6299              
- Misses       6030     6036       +6     
- Partials      546      551       +5     

Impacted Files	Coverage Δ
contrib/ondiskagg/aggtrigger/aggtrigger.go	53.65% <30.00%> (-1.90%)	:arrow_down:
frontend/query.go	51.19% <33.33%> (-0.62%)	:arrow_down:
uda/adjust/caloader.go	84.13% <33.33%> (-1.18%)	:arrow_down:
utils/timeframe.go	74.59% <100.00%> (ø)