Fix NPE

Add checking of NPE in getNumberFromIntent API of PhoneNumberUtils.

Test: atest CtsTelephonyTestCases

Change-Id: I507ee020a98a919edc35e6402c0b8f9f84898870
Signed-off-by: sung_jae <sung_jae.kim@samsung.com>

telephony/java/android/telephony/PhoneNumberUtils.java

@@ -217,6 +217,9 @@ public class PhoneNumberUtils {
         }
 
         String scheme = uri.getScheme();
+        if (scheme == null) {
+            return null;
+        }
 
         if (scheme.equals("tel") || scheme.equals("sip")) {
             return uri.getSchemeSpecificPart();