Squash empty rows and columns. Fix #1.

ods2md.py

@@ -49,21 +49,32 @@ def main(odf_path):
     ods = ezodf.opendoc(odf_path)
 
     for sheet in ods.sheets:
-        print('##', sheet.name)
-
         column_widths = [max(display_len(display_text(cell)) for cell in column) for column in sheet.columns()]
+        if not any(column_widths):
+            continue
+
+        print('##', sheet.name)
+        printed_header = False
+
+        for row in sheet.rows():
+            contents = [display_text(cell) for cell in row]
+            if not any(contents):
+                continue
 
-        for n, row in enumerate(sheet.rows()):
             print('|', end='')
-            for m, cell in enumerate(row):
-                content = display_text(cell)
-                disp_len = column_widths[m] + len(content) - display_len(content)
+            for m, content in enumerate(contents):
+                column_width = column_widths[m]
+                if not column_width:
+                    continue
+                disp_len = column_width + len(content) - display_len(content)
                 print(' {0:<{1}}'.format(content, disp_len), end=' |')
             print()
 
-            if n == 0:
+            if not printed_header:
+                printed_header = True
                 print('|', end='')
                 for w in column_widths:
+                    if w:
                         print(':', '-' * (w+1), '|', sep='', end='')
                 print()