Fix undefined offset in MethodGenerator

[ioleo]

Running symfony2 app/console cache:clear with zend-code version >= 3.0.0 gives this notice:

Notice: Undefined offset: 1 in {path}\vendor\zendframework\zend-code\src\Generator\MethodGenerator.php on line 98 PHP Notice: Undefined offset: 1 in {path}\vendor\zendframework\zend-code\src\Generator\MethodGenerator.php on line 98 

This PR fixes that adding a simple check.

[ioleo]

@Ocramius ready to review

[mikeSimonson]

Duplicate of #46 and #48. This solution at first look only avoid the error but does not do what the code expect to do.

[ioleo]

@mikeSimonson could you elaborate - what does the code expect to do, so I could submit a proper fix?

[mikeSimonson]

@loostro The original expect all the lines of the method to be returned in an array. It then try to properly indent thoses lines.

The change that you made just trim the whole body when the explode fail.

There are already 2 fixes for that issue #46 and #48. The maintainer just need to pick the one he find the most appropriate.

[ioleo]

@mikeSimonson I see. I hope this gets fixed soon :)