Fix not to show a log with empty default ime

It'll make reboot to show a log with empty defualt ime.

Bug: 18165757
Change-Id: I7a0d55bc0da0566a60abb24123c1dbcdd03be9ed
diff --git a/services/core/java/com/android/server/InputMethodManagerService.java b/services/core/java/com/android/server/InputMethodManagerService.java
index 1623eac..edea274 100644
--- a/services/core/java/com/android/server/InputMethodManagerService.java
+++ b/services/core/java/com/android/server/InputMethodManagerService.java
@@ -774,7 +774,11 @@
         if (defIm == null && mMethodList.size() > 0) {
             defIm = InputMethodUtils.getMostApplicableDefaultIME(
                     mSettings.getEnabledInputMethodListLocked());
-            Slog.i(TAG, "No default found, using " + defIm.getId());
+            if (defIm != null) {
+                Slog.i(TAG, "Default found, using " + defIm.getId());
+            } else {
+                Slog.i(TAG, "No default found");
+            }
         }
         if (defIm != null) {
             setSelectedInputMethodAndSubtypeLocked(defIm, NOT_A_SUBTYPE_ID, false);