Fix rendering in table with empty cells

`find_emph_char` returns 0 if the char specified is not found in the
current line, but this is also what happens when there's an empty
cell. This patch adds logic to work around this problem.

See uranusjr/macdown#321

1 files changed, 5 insertions, 0 deletions

diff --git a/test/config.json b/test/config.json
index d3e170e..365c7bc 100644
--- a/test/config.json
+++ b/test/config.json
@@ -106,6 +106,11 @@
             "input": "Tests/Underline.text",
             "output": "Tests/Underline.html",
             "flags": ["--underline"]
+        },
+        {
+            "input": "Tests/Table.text",
+            "output": "Tests/Table.html",
+            "flags": ["--tables"]
         }
     ]
 }