Additional Travis CI builds fixes: fix mistake in .travis.yml which b…

…roke everything, fix trouble caused integration tests failures on PHP 5.5/5.6, speed up composer install by bot preferring source, eliminate notice due to empty config value passed to @magentoConfigFixture

.travis.yml

@@ -50,8 +50,7 @@ before_script:
   # Change memory_limit for travis
   - echo 'memory_limit = -1' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
   - phpenv rehash;
-  - composer install --no-interaction --prefer-source --dev
-  - cd ..
+  - composer install --no-interaction --dev
 script:
   # Unit tests
   - sh -c "if [ '$TEST_SUITE' = 'unit' ]; then ./vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist; fi"

app/code/Magento/Directory/Helper/Data.php

@@ -182,7 +182,9 @@ public function getRegionJson()
                     ];
                 }
                 $json = $this->_coreHelper->jsonEncode($regions);
-
+                if ($json === false) {
+                    $json = 'false';
+                }
                 $this->_configCacheType->save($json, $cacheKey);
             }
             $this->_regionJson = $json;

dev/tests/integration/framework/Magento/TestFramework/Annotation/ConfigFixture.php

@@ -102,7 +102,8 @@ protected function _assignConfigData(\PHPUnit_Framework_TestCase $test)
             if (preg_match('/^.+?(?=_store\s)/', $configPathAndValue, $matches)) {
                 /* Store-scoped config value */
                 $storeCode = $matches[0] != 'current' ? $matches[0] : null;
-                list(, $configPath, $requiredValue) = preg_split('/\s+/', $configPathAndValue, 3);
+                $parts = preg_split('/\s+/', $configPathAndValue, 3);
+                list(, $configPath, $requiredValue) = $parts + ['', '', ''];
                 $originalValue = $this->_getConfigValue($configPath, $storeCode);
                 $this->_storeConfigValues[$storeCode][$configPath] = $originalValue;
                 $this->_setConfigValue($configPath, $requiredValue, $storeCode);