Regenerate websecurityscanner client (#4080)

Author: yoshi-automation

google-cloud-clients/google-cloud-websecurityscanner/src/main/java/com/google/cloud/websecurityscanner/v1alpha/stub/WebSecurityScannerStubSettings.java

@@ -319,7 +319,9 @@ public String extractNextToken(ListScanConfigsResponse payload) {
 
             @Override
             public Iterable<ScanConfig> extractResources(ListScanConfigsResponse payload) {
-              return payload.getScanConfigsList();
+              return payload.getScanConfigsList() != null
+                  ? payload.getScanConfigsList()
+                  : ImmutableList.<ScanConfig>of();
             }
           };
 
@@ -353,7 +355,9 @@ public String extractNextToken(ListScanRunsResponse payload) {
 
             @Override
             public Iterable<ScanRun> extractResources(ListScanRunsResponse payload) {
-              return payload.getScanRunsList();
+              return payload.getScanRunsList() != null
+                  ? payload.getScanRunsList()
+                  : ImmutableList.<ScanRun>of();
             }
           };
 
@@ -390,7 +394,9 @@ public String extractNextToken(ListCrawledUrlsResponse payload) {
 
             @Override
             public Iterable<CrawledUrl> extractResources(ListCrawledUrlsResponse payload) {
-              return payload.getCrawledUrlsList();
+              return payload.getCrawledUrlsList() != null
+                  ? payload.getCrawledUrlsList()
+                  : ImmutableList.<CrawledUrl>of();
             }
           };
 
@@ -424,7 +430,9 @@ public String extractNextToken(ListFindingsResponse payload) {
 
             @Override
             public Iterable<Finding> extractResources(ListFindingsResponse payload) {
-              return payload.getFindingsList();
+              return payload.getFindingsList() != null
+                  ? payload.getFindingsList()
+                  : ImmutableList.<Finding>of();
             }
           };