md_tw.py: Update TWRenderer.block_code.

Don't add prefix for empty lines.

* markdown_textwrap/_version.py (__version__): Update variable.
* md_tw.py (TWRenderer.block_code): Update method.

2 files changed, 2 insertions, 2 deletions

diff --git a/markdown_textwrap/_version.py b/markdown_textwrap/_version.py
index 288aac4..a5b4a8e 100644
--- a/markdown_textwrap/_version.py
+++ b/markdown_textwrap/_version.py
@@ -18,4 +18,4 @@
 #   along with markdown-textwrap (see COPYING).  If not, see
 #   <http://www.gnu.org/licenses/>.
 
-__version__ = '0.1.1'
+__version__ = '0.2.0.dev'
diff --git a/md_tw.py b/md_tw.py
index 1ceb800..b61c409 100644
--- a/md_tw.py
+++ b/md_tw.py
@@ -266,7 +266,7 @@ class TWRenderer(mistune.Renderer):
     def block_code(self, code, lang=None):
         out = '{}'.format(code)
         out = textwrap.indent(out, self.tw_get('initial_indent'),
-                              lambda line: True)
+                              lambda line: len(line.strip()) > 0)
         return out
 
     def block_quote(self,  text):