fix: support set but empty OHSOME_PLANTE_METRICS_PORT enviroment

Author: rtroilo

ohsome-planet-cli/src/main/java/org/heigit/ohsome/planet/cmd/Contributions.java

@@ -18,6 +18,7 @@
 import java.util.concurrent.Callable;
 
 import static com.google.common.io.RecursiveDeleteOption.ALLOW_INSECURE;
+import static java.util.function.Predicate.not;
 
 @CommandLine.Command(name = "contributions",
         mixinStandardHelpOptions = true,
@@ -123,6 +124,7 @@ public Integer call() throws Exception {
         }
 
         var httpServer = Optional.ofNullable(System.getProperty(OHSOME_PLANET_METRICS_PORT, System.getenv(OHSOME_PLANET_METRICS_PORT)))
+                .filter(not(String::isBlank))
                 .map(Integer::parseInt)
                 .map(port -> HTTPServer.builder().port(port));
         try (var ignored = (httpServer.isPresent()) ? httpServer.get().buildAndStart() : null;

ohsome-planet-cli/src/main/java/org/heigit/ohsome/planet/cmd/Replications.java

@@ -11,8 +11,11 @@
 
 import java.nio.file.Path;
 import java.security.InvalidParameterException;
+import java.util.Optional;
 import java.util.concurrent.Callable;
 
+import static java.util.function.Predicate.not;
+
 @Command(name = "replications",
         versionProvider = ManifestVersionProvider.class,
         mixinStandardHelpOptions = true,
@@ -141,9 +144,11 @@ public Integer call() throws Exception {
             throw new InvalidParameterException("Either just-contributions or just-changesets can be specified");
         }
 
-        var metricsPort = System.getProperty(OHSOME_PLANET_METRICS_PORT, System.getenv(OHSOME_PLANET_METRICS_PORT));
-        try (var ignored = (metricsPort != null ) ?
-                HTTPServer.builder().port(Integer.parseInt(metricsPort)).buildAndStart() : null ) {
+        var httpServer = Optional.ofNullable(System.getProperty(OHSOME_PLANET_METRICS_PORT, System.getenv(OHSOME_PLANET_METRICS_PORT)))
+                .filter(not(String::isBlank))
+                .map(Integer::parseInt)
+                .map(port -> HTTPServer.builder().port(port));
+        try (var ignored = (httpServer.isPresent()) ? httpServer.get().buildAndStart() : null) {
 
             JvmMetrics.builder().register();