Comments at the beginning of the line confuse references

[tripodsan]

Commenting out lines at the first position, confuses the parser. eg:

Error document:

map:
   foo0:
     key2: value2
         
#   foo1:
#     key0: value0
#     key1: value1

   foo2:
     key3: value3

.toJSON():

[{"map": {"foo0": {"key2": "value2"}}}, {"foo2": null}, {"key3": null}, "value3"]

Successful document:

map:
   foo0:
     key2: value2
         
   #foo1:
     #key0: value0
     #key1: value1

   foo2:
     key3: value3

.toJSON():

{"map": {"foo0": {"key2": "value2"}, "foo2": {"key3": "value3"}}}

[eemeli]

This turned out to be a single-line fix, once I figured what was going on. In order to associate less-indented comments with the subsequent rather than the preceding node there's a check for the following node's indentation level, and that check wasn't dealing properly with blank lines. I'll package a new release within a few days that includes this.