Fixes fabio for files with prefix

Author: nicwade

savu/data/data_structures/data_types/fabIO.py

@@ -69,8 +69,9 @@ def __get_file_name(self, folder, prefix):
 #        files = os.listdir(folder)
         fullpath = str.strip(folder)
         if prefix is not None:
-            fullpath = os.path.join(folder, prefix)
-        fullpath += "/*"
+            fullpath = os.path.join(folder, prefix + '*')
+        else:
+            fullpath += "/*"
         files = glob.glob(fullpath)
         self.nFrames = len(files)