template: Bugfix newline handling.

If a rendering ended with a zeroed out split, the output would contain an
extraneous trailing newline.  Rearrange the code to print a newline
preceding each content line.

import2ledger/template.py

@@ -165,7 +165,7 @@ class AccountSplitter:
                 account_s = account.format_map(template_vars)
                 amount_s = babel.numbers.format_currency(amount, template_vars['currency'], amt_fmt)
                 sep_len = max(2, self.TARGET_ACCTLINE_LEN - len(account_s) - len(amount_s))
-                yield '    {}{}{}\n{}'.format(
+                yield '\n    {}{}{}{}'.format(
                     account_s, ' ' * sep_len, amount_s,
                     metadata.format_map(template_vars),
                 )
@@ -214,14 +214,12 @@ class Template:
                 amount_expr = line[match.end():]
                 self.splitter.add(account, amount_expr)
                 self.format_funcs.append(self.splitter.render_next)
-        if metadata:
-            self._add_str_func(metadata)
-            if not metadata[-1].endswith('\n'):
-                self.format_funcs.append('\n'.format_map)
+        self._add_str_func(metadata)
+        self.format_funcs.append('\n'.format_map)
 
     def _nonblank_lines(self, s):
         for line in s.splitlines(True):
-            line = line.lstrip()
+            line = line.strip()
             if line:
                 yield line
 
@@ -234,12 +232,12 @@ class Template:
         if self.PAYEE_LINE_RE.match(line1):
             yield '\n' + line1
         else:
-            yield '\n{date} {payee}\n'
+            yield '\n{date} {payee}'
             yield line1
         yield from lines
 
     def _add_str_func(self, str_seq):
-        str_flat = ''.join('      ' + s for s in str_seq)
+        str_flat = ''.join('\n      ' + s for s in str_seq)
         if not str_flat:
             pass
         elif self.splitter.is_empty():