Only check semver range if ember-source is present (#423)

Only check semver range if ember-source is present

Author: Robert Jackson

lib/ember-addon-main.js

@@ -30,7 +30,8 @@ module.exports = {
     let babelVersion = hasBabel && babel.pkg.version;
 
     let ember = this.project.addons.find(a => a.name === 'ember-source');
-    let emberVersion = ember !== undefined && ember.pkg.version;
+    let hasEmberSource = ember !== undefined;
+    let emberVersion = hasEmberSource && ember.pkg.version;
 
     // using this.project.emberCLIVersion() allows us to avoid issues when `npm
     // link` is used; if this addon were linked and we did something like
@@ -43,7 +44,7 @@ module.exports = {
 
     // once a polyfill is written, we will need to update this logic to check
     // for _either_ `[email protected]` or the polyfill
-    let hasValidEmberVersion = semver.gte(emberVersion, '3.13.0');
+    let hasValidEmberVersion = hasEmberSource && semver.gte(emberVersion, '3.13.0');
 
     this._cachedShouldColocateTemplates =
       hasValidEmberVersion && hasValidBabelVersion && hasValidEmberCLIVersion;