Merge branch '2.7' into 2.8

* 2.7:
  [Yaml] fix exception contexts
  People - person singularization
  [Yaml] properly handle unindented collections
  [Serializer] Add test for ignored attributes during denormalization
  chomp newlines only at the end of YAML documents
  Fixed server status command when port has been omitted
  Update UPGRADE FROM 2.x to 3.0
  Catch \Throwable
  Use levenshtein level for better Bundle matching
  [WebProfilerBundle] Fix CORS ajax security issues

Author: fabpot

OptionsResolver.php

@@ -861,6 +861,9 @@ public function offsetGet($option)
             } catch (\Exception $e) {
                 unset($this->calling[$option]);
                 throw $e;
+            } catch (\Throwable $e) {
+                unset($this->calling[$option]);
+                throw $e;
             }
             unset($this->calling[$option]);
             // END
@@ -963,6 +966,9 @@ public function offsetGet($option)
             } catch (\Exception $e) {
                 unset($this->calling[$option]);
                 throw $e;
+            } catch (\Throwable $e) {
+                unset($this->calling[$option]);
+                throw $e;
             }
             unset($this->calling[$option]);
             // END