[PATCH b4 2/2] Fix handling of single-paragraph commit message bodies

["Kyle Meyer" <kyle@kyleam.com>]

The get_body_parts() method added in ba6c790 (Parse body parts into
usual chunks, 2020-04-27) strips lines that look like trailers from
the last paragraph, storing the other lines to add back to the
message.  However, if the commit message has only a single paragraph,
get_body_parts() returns early, unconditionally returning an empty
string for the message even if non-trailer lines were encountered.

Return the collected non-trailer lines, if any, as the message.

Signed-off-by: Kyle Meyer <kyle@kyleam.com>
---
 b4/__init__.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/b4/__init__.py b/b4/__init__.py
index 7e3134f..b7b33f4 100644
--- a/b4/__init__.py
+++ b/b4/__init__.py
@@ -1241,6 +1241,8 @@ def get_body_parts(body):
             if githeaders == trailers:
                 # This is a message that consists of just trailers?
                 githeaders = list()
+            if nlines:
+                message = '\n'.join(nlines)
             return githeaders, message, trailers, basement, signature
 
         # Add all parts between first and last to mparts
-- 
2.27.0