exception in get_results when build_number is specified

[chrisbainbridge]

When the result query includes a build number, the server returns response type "resultDetails" (not "restResults" as returned by /result) which is singular but code expects a response containing 'results', resulting in:

>>> list(bamboo.get_results(key, '32'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "bamboo_api/api.py", line 372, in get_results
    results = response['results']

Fix may be something like:

diff --git a/bamboo_api/api.py b/bamboo_api/api.py
index 6deaf7b..01add81 100644
--- a/bamboo_api/api.py
+++ b/bamboo_api/api.py
@@ -369,6 +369,10 @@ class BambooAPIClient(object):
         while qs['start-index'] < size:
             # Get page, update page size and yield branches
             response = self._get_response(url, qs).json()
+            # querying a build_number returns only one response
+            if 'results' not in response:
+                yield response
+                return
             results = response['results']
             size = results['size']
             for r in results['result']:

Or just a new method get_result() to return the single object.