[test] Fix assert for predictable mode in test runner.

tools/testrunner/local/execution.py

Index: tools/testrunner/local/execution.py
diff --git a/tools/testrunner/local/execution.py b/tools/testrunner/local/execution.py
index e13393bf1c7626f1d64a48ab627e1f8dec1679aa..2b2f876d24f06a421853e41d24f2ab1be6d5acca 100644
--- a/tools/testrunner/local/execution.py
+++ b/tools/testrunner/local/execution.py
@@ -255,8 +255,13 @@ class Runner(object):
     if queued_exception:
       raise queued_exception
 
-    # Make sure that any allocations were printed in predictable mode.
-    assert not self.context.predictable or self.printed_allocations
+    # Make sure that any allocations were printed in predictable mode (if we
+    # ran any tests).
+    assert (
+        not self.total or
+        not self.context.predictable or
+        self.printed_allocations
+    )
 
   def _VerbosePrint(self, text):
     if self.context.verbose: