get_bool raises a different Exception than the other getters when key is missing

[movermeyer]

The following code:

from pyhocon import ConfigFactory
config = ConfigFactory.parse_string("")

for getter in [config.get, config.get_string, config.get_list, config.get_int, config.get_float, config.get_config, config.get_bool]:
    try:
        getter("missing_value")
    except Exception as exc:
        print str(getter), type(exc)
        print "\t", exc

produces the following output:

<bound method ConfigTree.get of ConfigTree()> <class 'pyhocon.exceptions.ConfigMissingException'>
        u'No configuration setting found for key missing_value'
<bound method ConfigTree.get_string of ConfigTree()> <class 'pyhocon.exceptions.ConfigMissingException'>
        u'No configuration setting found for key missing_value'
<bound method ConfigTree.get_list of ConfigTree()> <class 'pyhocon.exceptions.ConfigMissingException'>
        u'No configuration setting found for key missing_value'
<bound method ConfigTree.get_int of ConfigTree()> <class 'pyhocon.exceptions.ConfigMissingException'>
        u'No configuration setting found for key missing_value'
<bound method ConfigTree.get_float of ConfigTree()> <class 'pyhocon.exceptions.ConfigMissingException'>
        u'No configuration setting found for key missing_value'
<bound method ConfigTree.get_config of ConfigTree()> <class 'pyhocon.exceptions.ConfigMissingException'>
        u'No configuration setting found for key missing_value'
<bound method ConfigTree.get_bool of ConfigTree()> <class 'pyhocon.exceptions.ConfigException'>
        missing_value does not translate to a Boolean value

All the "getters", except get_bool, raise pyhocon.exceptions.ConfigMissingException, while get_bool raises pyhocon.exceptions.ConfigException.

This bug/inconsistency was introduced in the change from 0.3.35 -> 0.3.36.
Tested with Python 2.7.5

[movermeyer]

This is a result of #120, which made ConfigMissingException inherit from KeyError as well.