bug #509 Fix dealing with locally patched packages (nicolas-grekas)

This PR was merged into the 1.2-dev branch.

Discussion
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Fix dealing with locally patched packages

Fixes #508
Happens on the CI when local packages are built for testing PRs.

Commits
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42bdc9f Fix dealing with locally patched packages

src/Cache.php

@@ -66,7 +66,7 @@ public function read($file)
 
     public function removeLegacyTags(array $data): array
     {
-        if (!$this->symfonyConstraints) {
+        if (!$this->symfonyConstraints || !isset($data['packages'])) {
             return $data;
         }
 
@@ -78,6 +78,8 @@ public function removeLegacyTags(array $data): array
             foreach ($versions as $version => $composerJson) {
                 if ('dev-master' === $version) {
                     $normalizedVersion = $this->versionParser->normalize($devMasterAlias);
+                } elseif (!isset($composerJson['version_normalized'])) {
+                    continue;
                 } else {
                     $normalizedVersion = $composerJson['version_normalized'];
                 }
@@ -97,6 +99,8 @@ public function removeLegacyTags(array $data): array
         foreach ($symfonySymfony as $version => $composerJson) {
             if ('dev-master' === $version) {
                 $normalizedVersion = $this->versionParser->normalize($composerJson['extra']['branch-alias']['dev-master']);
+            } elseif (!isset($composerJson['version_normalized'])) {
+                continue;
             } else {
                 $normalizedVersion = $composerJson['version_normalized'];
             }