Fixed invalid parsing of ids

without this change when someone has provided an empty value of port then a default classifier was set instead of picking the provided one

fixes #176

spring-cloud-contract-stub-runner/src/main/java/org/springframework/cloud/contract/stubrunner/StubConfiguration.java

@@ -76,7 +76,7 @@ public class StubConfiguration {
 			stubsGroupId = splitPath[0];
 			stubsArtifactId = splitPath[1];
 			stubsVersion = splitPath.length >= 3 ? splitPath[2] : DEFAULT_VERSION;
-			stubsClassifier = splitPath.length == 4 ? splitPath[3] : defaultClassifier;
+			stubsClassifier = splitPath.length >= 4 ? splitPath[3] : defaultClassifier;
 		}
 		return new String[] { stubsGroupId, stubsArtifactId, stubsVersion,
 				stubsClassifier };

spring-cloud-contract-stub-runner/src/main/java/org/springframework/cloud/contract/stubrunner/util/StubsParser.java

@@ -102,8 +102,7 @@ public class StubsParser {
 			try {
 				port = Integer.valueOf(splitEntry[splitEntry.length-1]);
 				id = id.substring(0, id.lastIndexOf(":"));
-			} catch (NumberFormatException e) {
-			}
+			} catch (NumberFormatException e) {}
 			return new StubSpecification(new StubConfiguration(id, defaultClassifier), port);
 		}
 

spring-cloud-contract-stub-runner/src/test/groovy/org/springframework/cloud/contract/stubrunner/StubRunnerOptionsBuilderSpec.groovy

@@ -16,6 +16,7 @@
 
 package org.springframework.cloud.contract.stubrunner
 
+import spock.lang.Issue
 import spock.lang.Specification
 
 class StubRunnerOptionsBuilderSpec extends Specification {
@@ -81,4 +82,17 @@ class StubRunnerOptionsBuilderSpec extends Specification {
 		then:
 		options.getDependencies().toString() == '[foo:bar:+:xxx]'
 	}
+
+	@Issue("#176")
+	def shouldCreateDependenciesWithEmptyPort() {
+
+		given:
+		builder.withStubs('groupId:artifactId:version:classifier:')
+
+		when:
+		StubRunnerOptions options = builder.build()
+
+		then:
+		options.getDependencies().toString() == '[groupId:artifactId:version:classifier]'
+	}
 }