[Twig] fixed TwigEngine::exists() method when a template contains a syntax error (closes #88546)
merged branch fabpot/twig-engine-exists (PR #8547)

This PR was merged into the 2.2 branch.

Discussion
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[Twig] fixed TwigEngine::exists() method when a template contains a syntax error (closes #8546)

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8546
| License       | MIT
| Doc PR        | n/a

Commits
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ae7fa11 [Twig] fixed TwigEngine::exists() method when a template contains a syntax error (closes #88546)
[Tests] Tests on php 5.5 should pass

Because php 5.5 is stable now
merged branch lyrixx/php55 (PR #8559)

This PR was merged into the 2.2 branch.

Discussion
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[Tests] Tests on php 5.5 should pass

Because php 5.5 is stable now

Commits
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0086ee3 [Tests] Tests on php 5.5 should pass
return 0 if there is no valid data
merged branch dominikzogg/timecollectorfix (PR #8581)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #8581).

Discussion
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TimeCollector, Notice, if no events

https://github.com/symfony/symfony/issues/8574

Commits
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e9da1c0 return 0 if there is no valid data
Merge branch '2.2' into 2.3

* 2.2:
  return 0 if there is no valid data
  [Tests] Tests on php 5.5 should pass
  [Twig] fixed TwigEngine::exists() method when a template contains a syntax error (closes #88546)