fixed issue #52

[issaTan]

fixed issue #52

Still have issue #52 .
I found the reason, here's the code.

   // backup the title chunk in case user wants access to it
    if (info.title) {
      info.titleChunk = info.title;
    }

    // replace title with populated template
    if (info.titleTemplate) {
      info.title = applyTemplate(component)(info.titleTemplate)(info.titleChunk);
    }
    ...
    var applyTemplate = function (component) { return function (template) { return function (chunk) { return typeof template === 'function' ? template.call(component, chunk) : template.replace(/%s/g, chunk); }; }; };

At line 514, info.title === '' is true, so info.titleChunk is undefined, but info.titleTemplate === '%s | MySite' still true, so when template.replace(/%s/g, chunk), it will return undefined | MySite.

[codecov]

Codecov Report

Merging #274 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #274   +/-   ##
======================================
  Coverage    40.3%   40.3%           
======================================
  Files          18      18           
  Lines         263     263           
======================================
  Hits          106     106           
  Misses        157     157

Impacted Files	Coverage Δ
src/shared/getMetaInfo.js	94.64% <100%> (ø)	⬆️

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