JIRAError does not correctly display full error information

[asqui]

There seems to be a bug in JIRAError.__str__

    if self.response and hasattr(self.response, 'text'):
        t += "\n\tresponse text = " % self.response.headers

https://github.com/pycontribs/jira/blob/master/jira/utils.py#L161

1. This checks for the text attribute but then uses the headers attribute (cut-and-paste error from the lines above?)
2. The response object is "Truthy" based upon the HTTP response, so in the case of a HTTP error it is actually "False" so the conditional check fails.
3. Which is just as well, because once you fix this you'll see that the format string is invalid and causes an exception because it is missing a %s at the end

:-)

I'll submit a pull request to fix this up shortly.

[asqui]

Citation from PEP-8, just to ram the point home:

beware of writing if x when you really mean if x is not None -- e.g. when testing whether a variable or argument that defaults to None was set to some other value. The other value might have a type (such as a container) that could be false in a boolean context!

https://www.python.org/dev/peps/pep-0008/