Fix empty ini handling (composer#105)

* add `scan-empty.ini` empty file Fixture

* add `scan-empty.ini` to fail tests

* fix `file_get_contents` failure handling

Author: pdelre

src/XdebugHandler.php

@@ -333,7 +333,7 @@ private function writeTmpIni(array $iniFiles, $tmpDir, &$error)
 
         foreach ($iniFiles as $file) {
             // Check for inaccessible ini files
-            if (!$data = @file_get_contents($file)) {
+            if (($data = @file_get_contents($file)) === false) {
                 $error = 'Unable to read ini: '.$file;
                 return false;
             }

tests/Fixtures/scandir/scan-empty.ini

@@ -60,6 +60,7 @@ public function setScannedInis()
             '',
             $this->scanDir.DIRECTORY_SEPARATOR.'scan-one.ini',
             $this->scanDir.DIRECTORY_SEPARATOR.'scan-two.ini',
+            $this->scanDir.DIRECTORY_SEPARATOR.'scan-empty.ini',
         );
 
         $this->setEnvironment();
@@ -71,6 +72,7 @@ public function setAllInis()
             $this->loadedIni,
             $this->scanDir.DIRECTORY_SEPARATOR.'scan-one.ini',
             $this->scanDir.DIRECTORY_SEPARATOR.'scan-two.ini',
+            $this->scanDir.DIRECTORY_SEPARATOR.'scan-empty.ini',
         );
 
         $this->setEnvironment();