rebaseline.py: fix --add-new when there are no expectations at all

tools/tests/rebaseline/input/json1/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Release/expected-results.json

Index: tools/tests/rebaseline/input/json1/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Release/expected-results.json
===================================================================
--- tools/tests/rebaseline/input/json1/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Release/expected-results.json	(revision 11054)
+++ tools/tests/rebaseline/input/json1/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Release/expected-results.json	(working copy)
@@ -1,26 +1 @@
-{
-   "expected-results" : {
-      "aaclip_565.png" : {
-         "allowed-digests" : [
-            [ "bitmap-64bitMD5", 12345 ]
-         ],
-         "ignore-failure" : false
-      },
-      "aaclip_8888.png" : {
-         "allowed-digests" : [
-            [ "bitmap-64bitMD5", 67890 ]
-         ],
-         "ignore-failure" : false
-      },
-      "aaclip_gpu.png" : {
-         "allowed-digests" : [
-            [ "bitmap-64bitMD5", 11899819492385205974 ]
-         ],
-         "ignore-failure" : false
-      },
-      "aaclip_pdf.png" : {
-         "allowed-digests" : null,
-         "ignore-failure" : false
-      }
-   }
-}
+{}

[epoger, 2013/09/03 15:06:09]

Patchset 1: change the expectations for one self-test platform to be completely
empty.