Indenting at the first position in file fails/crashes

[Beta-Alf]

This happens under Spyder 3.0.0-dev (from winpython) as well as Spyder 2.3.5.2 (from Arch Repos).
Under windows it simply crashes the application, under Linux I get a nice traceback:

Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/spyderlib/widgets/sourcecode/codeeditor.py", line 2466, in keyPressEvent
    self.intelligent_tab()
  File "/usr/lib/python3.4/site-packages/spyderlib/widgets/sourcecode/codeeditor.py", line 758, in intelligent_tab
    self.indent_or_replace()
  File "/usr/lib/python3.4/site-packages/spyderlib/widgets/sourcecode/codeeditor.py", line 1930, in indent_or_replace
    self.indent()
  File "/usr/lib/python3.4/site-packages/spyderlib/widgets/sourcecode/codeeditor.py", line 1916, in indent
    if not self.fix_indent(forward=True):
  File "/usr/lib/python3.4/site-packages/spyderlib/widgets/sourcecode/codeeditor.py", line 1822, in fix_indent
    correct_indent = self.get_block_indentation(prevline)
UnboundLocalError: local variable 'prevline' referenced before assignment

The problem is clear: there is no previous line

[Beta-Alf]

I am trying to fix this, but I am unsure whether to do this in intelligent_tab (checking for cursor position) or in fix_indent (making sure that no codepath ever hits this problem again). It should probably be the latter.