Code smell: Use ||= for conditional initialization

Replaced 55 occurances of

    ([$@]?\w+) += +(.*) +(if +\1.nil\?|if +! *\1|unless +\1|unless +defined\?\(\1\))$

with

    \1 ||= \2

3 Examples:

    The code:
        @sync
    becomes:
        @sync
    The code:

    becomes:

    The code:
        if @yydebug
    becomes:
        if @yydebug

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/puppet/parser/ast/branch.rb b/lib/puppet/parser/ast/branch.rb
index 0be6ca018..96d065e4c 100644
--- a/lib/puppet/parser/ast/branch.rb
+++ b/lib/puppet/parser/ast/branch.rb
@@ -23,7 +23,7 @@ class Puppet::Parser::AST
             super(arghash)
 
             # Create the hash, if it was not set at initialization time.
-            @children = [] unless defined?(@children)
+            @children ||= []
 
             # Verify that we only got valid AST nodes.
             @children.each { |child|