Increase code coverage

[joenzkc]

Current changes:

• Increase code coverage of log command from 92% to 100% (fix all partial code coverage)
• Increase code coverage of logic manager

[codecov-commenter]

Codecov Report

Merging #224 (4c20799) into master (7939efd) will increase coverage by 0.85%. The diff coverage is 82.14%.

@@             Coverage Diff              @@
##             master     #224      +/-   ##
============================================
+ Coverage     62.30%   63.15%   +0.85%     
- Complexity      663      690      +27     
============================================
  Files            94       94              
  Lines          2573     2584      +11     
  Branches        335      346      +11     
============================================
+ Hits           1603     1632      +29     
+ Misses          870      854      -16     
+ Partials        100       98       -2     

Impacted Files	Coverage Δ
.../java/seedu/address/logic/commands/LogCommand.java	96.00% <75.00%> (+3.57%)	:arrow_up:
...a/seedu/address/logic/parser/LogCommandParser.java	90.90% <87.50%> (+40.90%)	:arrow_up:
src/main/java/seedu/address/model/tag/Tag.java	91.66% <0.00%> (-8.34%)	:arrow_down:
...in/java/seedu/address/logic/parser/ParserUtil.java	78.12% <0.00%> (-2.73%)	:arrow_down:
...rc/main/java/seedu/address/logic/LogicManager.java	100.00% <0.00%> (+8.33%)	:arrow_up:
...rc/main/java/seedu/address/model/ModelManager.java	90.58% <0.00%> (+9.41%)	:arrow_up:

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