Remove usages of Commons Lang 2 (#212)

Author: jonesbusy

src/main/java/jenkins/plugins/http_request/HttpRequestExecution.java

@@ -24,7 +24,6 @@
 import javax.net.ssl.X509ExtendedTrustManager;
 
 import org.apache.commons.io.IOUtils;
-import org.apache.commons.lang.StringUtils;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpHeaders;
 import org.apache.http.HttpHost;
@@ -185,9 +184,9 @@ private HttpRequestExecution(
 		this.httpMode = httpMode;
 		this.ignoreSslErrors = ignoreSslErrors;
 
-		if (StringUtils.isNotBlank(httpProxy)) {
+		if (httpProxy != null && !httpProxy.isBlank()) {
 			this.httpProxy = HttpHost.create(httpProxy);
-			if (StringUtils.isNotBlank(proxyAuthentication)) {
+			if (proxyAuthentication != null && !proxyAuthentication.isBlank()) {
 
 				StandardCredentials credential = CredentialsMatchers.firstOrNull(
 						CredentialsProvider.lookupCredentials(