Minor Bug Fix

[jamesebond]

Fix Error message on entering integers less than equal 0/non-integers

[teoks0199]

lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (93d6ec6) 54.00% compared to head (6ae798d) 61.14%.
Report is 18 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #214      +/-   ##
============================================
+ Coverage     54.00%   61.14%   +7.13%     
- Complexity      573      622      +49     
============================================
  Files           124      124              
  Lines          2444     2455      +11     
  Branches        248      248              
============================================
+ Hits           1320     1501     +181     
+ Misses         1059      885     -174     
- Partials         65       69       +4     

Files	Coverage Δ
...address/logic/parser/DeleteStallCommandParser.java	78.57% <100.00%> (+1.64%)	⬆️
...in/java/seedu/address/logic/parser/ParserUtil.java	97.67% <100.00%> (+9.30%)	⬆️

... and 30 files with indirect coverage changes

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[samuelmui8]

lgtm