fix: fix gcloud SDK detection on Windows (#384)

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Author: kevin-wise

google-cloud-core/src/main/java/com/google/cloud/testing/BaseEmulatorHelper.java

@@ -47,7 +47,6 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
-import java.util.Map;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
@@ -275,13 +274,8 @@ public Process getProcess() {
  }
 
  private boolean isGcloudInstalled() {
- Map<String, String> env = System.getenv();
- for (String envName : env.keySet()) {
- if ("PATH".equals(envName)) {
- return env.get(envName).contains("google-cloud-sdk");
- }
- }
- return false;
+ String path = System.getenv("PATH");
+ return path != null && path.contains("google-cloud-sdk");
  }
 
  private boolean isEmulatorUpToDate() throws IOException, InterruptedException {