codec2: trim log

Bug: 132461433
Test: bug repro steps
Change-Id: Ie79b8948dc2eae773a433d90c23e7b6924bd503e
diff --git a/media/codec2/sfplugin/CCodec.cpp b/media/codec2/sfplugin/CCodec.cpp
index aa7189c..895be1a 100644
--- a/media/codec2/sfplugin/CCodec.cpp
+++ b/media/codec2/sfplugin/CCodec.cpp
@@ -374,7 +374,11 @@
 
         // consumer usage is queried earlier.
 
-        ALOGD("ISConfig%s", status.str().c_str());
+        if (status.str().empty()) {
+            ALOGD("ISConfig not changed");
+        } else {
+            ALOGD("ISConfig%s", status.str().c_str());
+        }
         return err;
     }