Bugfix for gtTIFVolWriter

git-svn-id: https://svn.code.sf.net/p/dct/code/trunk@946 4c865b51-4357-4376-afb4-474e03ccb993

zUtil_TIFF/gtTIFVolWriter.m

@@ -190,7 +190,7 @@ tifTag.Software = 'matlabDCT';
 % Guessing output directory, filename and extension
 [fpath, fname, fext] = fileparts(filename);
 % Trick to handle ~ path in unix
-if fpath(1)=='~' && isunix()
+if ~isempty(fpath) && isunix && fpath(1)=='~'
     fpath(1) = '';
     fpath = fullfile(getenv('HOME'), fpath);
 end