dont cache when parsing fails with error

// FREEBIE

src/Contacts/PhoneNumber.m

@@ -22,14 +22,14 @@ static NSString *const RPDefaultsKeyPhoneNumberCanonical = @"RPDefaultsKeyPhoneN
     NBPhoneNumber *number = [phoneUtil parse:text defaultRegion:regionCode error:&parseError];
 
     if (parseError) {
-        DDLogWarn(@"Issue while parsing number: %@", [parseError description]);
+        DDLogDebug(@"Issue while parsing number: %@", [parseError description]);
         return nil;
     }
 
     NSError *toE164Error;
     NSString *e164 = [phoneUtil format:number numberFormat:NBEPhoneNumberFormatE164 error:&toE164Error];
     if (toE164Error) {
-        DDLogWarn(@"Issue while parsing number: %@", [toE164Error description]);
+        DDLogDebug(@"Issue while formatting number: %@", [toE164Error description]);
         return nil;
     }
 

src/Contacts/PhoneNumberUtil.m

@@ -52,6 +52,13 @@
 
     if (!result) {
         result = [self.nbPhoneNumberUtil parse:numberToParse defaultRegion:defaultRegion error:error];
+        if (error && *error) {
+            OWSAssert(!result);
+            return nil;
+        }
+
+        OWSAssert(result);
+
         if (result) {
             [self.parsedPhoneNumberCache setObject:result forKey:hashKey];
         } else {