fix: Gracefully handle no schedule in Bump()

[irvinlim]

Closes #101.

[codecov]

Codecov Report

Base: 63.50% // Head: 63.53% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (812082d) compared to base (5ad6ccc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
+ Coverage   63.50%   63.53%   +0.03%     
==========================================
  Files         205      205              
  Lines       10958    10957       -1     
==========================================
+ Hits         6959     6962       +3     
+ Misses       3621     3619       -2     
+ Partials      378      376       -2     

Impacted Files	Coverage Δ
pkg/execution/util/schedule/schedule.go	77.32% <100.00%> (+1.60%)	⬆️
pkg/utils/heap/heap.go	100.00% <0.00%> (+1.07%)	⬆️

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