Add guard clause in Less Analyzer for Less imports of external files #74
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Related to #73 - option 1, if you wish to see a more indepth writeup
The Less Analyzer class cannot handle Less files that import css via
@import url()
as the object they convert into mean the $node->path->value is a Link_Tree_Quoted object and not a string castable value, so we ignore them as outside content is may not be relevant to the semver check.