fixed the test.

theano/printing.py

@@ -112,26 +112,27 @@ def debugprint(obj, depth=-1, print_type=False,
         debugmode.debugprint(r, depth=depth, done=done, print_type=print_type,
                              file=_file, order=order, ids=ids,
                              scan_ops=scan_ops, stop_on_name=stop_on_name)
-
-    new_prefix = ' >'
-    new_prefix_child = ' >'
-    print >> file, "\nInner of the scan. "
-
-    for s in scan_ops:
-        debugmode.debugprint(s, depth=depth, done=done, print_type=print_type,
-                             file=_file, ids=ids,
-                             scan_ops=scan_ops, stop_on_name=stop_on_name)
-
-        if hasattr(s.owner, 'op') and isinstance(s.owner.op, theano.scan_module.scan_op.Scan):
-            for idx, i in enumerate(s.owner.op.outputs):
-                if hasattr(i, 'owner') and hasattr(i.owner, 'op'):
-                    if isinstance(i.owner.op, theano.scan_module.scan_op.Scan):
-                        scan_ops.append(i)
-                debugmode.debugprint(r=i, prefix=new_prefix, depth=depth, done=done,
-                           print_type=print_type, file=file,
-                           ids=ids, stop_on_name=stop_on_name,
-                           prefix_child=new_prefix_child, scan_ops=scan_ops)
-
+    if len(scan_ops) > 0:
+        print >> file, "\n"
+        new_prefix = ' >'
+        new_prefix_child = ' >'
+        print >> file, "Inner of the scan."
+
+        for s in scan_ops:
+            debugmode.debugprint(s, depth=depth, done=done, print_type=print_type,
+                                 file=_file, ids=ids,
+                                 scan_ops=scan_ops, stop_on_name=stop_on_name)
+
+            if hasattr(s.owner, 'op') and isinstance(s.owner.op, theano.scan_module.scan_op.Scan):
+                for idx, i in enumerate(s.owner.op.outputs):
+                    if hasattr(i, 'owner') and hasattr(i.owner, 'op'):
+                        if isinstance(i.owner.op, theano.scan_module.scan_op.Scan):
+                            scan_ops.append(i)
+
+                    debugmode.debugprint(r=i, prefix=new_prefix, depth=depth, done=done,
+                                         print_type=print_type, file=file,
+                                         ids=ids, stop_on_name=stop_on_name,
+                                         prefix_child=new_prefix_child, scan_ops=scan_ops)
 
     if file is _file:
         return file