Accept empty AS names.

Partially takes back b45c630b.

src/main/java/org/torproject/metrics/onionoo/updater/LookupService.java

@@ -250,11 +250,6 @@ public class LookupService {
           }
           String asNumber = "AS" + String.valueOf(Integer.parseInt(parts[1]));
           String asName = parts[2];
-          if (asName.isEmpty()) {
-            log.error("Illegal AS name in '{}' in {}.", line,
-                this.geoLite2AsnBlocksIpv4CsvFile.getAbsolutePath());
-            return lookupResults;
-          }
           while (firstAddressNumber < startIpNum
               && firstAddressNumber != -1L) {
             sortedAddressNumbers.remove(firstAddressNumber);

src/test/java/org/torproject/metrics/onionoo/updater/LookupServiceTest.java

@@ -440,13 +440,14 @@ public class LookupServiceTest {
   }
 
   @Test()
-  public void testLookupGeoLite2AsnBlocksIpv4TooFewFieldsNoAsName() {
+  public void testLookupGeoLite2AsnBlocksIpv4AsNameEmpty() {
     List<String> geoLite2AsnBlocksIpv4Lines = new ArrayList<>();
     geoLite2AsnBlocksIpv4Lines.add("network,autonomous_system_number,"
         + "autonomous_system_organization");
     geoLite2AsnBlocksIpv4Lines.add("8.8.8.0/24,15169,");
     this.assertLookupResult(null, null, geoLite2AsnBlocksIpv4Lines, "8.8.8.8",
-        null, null, null, null, null, null, null, null);
+        "us", "United States", "California", "Mountain View", 37.3860f,
+        -122.0838f, "AS15169", "");
   }
 
   @Test()