Squash a couple of warnings

Author: acogoluegnes

src/main/java/com/rabbitmq/stream/Environment.java

@@ -57,7 +57,7 @@ static EnvironmentBuilder builder() {
   /**
    * Delete a stream
    *
-   * @param stream
+   * @param stream the stream to delete
    */
   void deleteStream(String stream);
 
@@ -66,7 +66,7 @@ static EnvironmentBuilder builder() {
    *
    * <p>Requires RabbitMQ 3.11 or more.
    *
-   * @param stream
+   * @param stream the stream to get statistics from
    * @return statistics on the stream
    * @throws UnsupportedOperationException if the broker does not support this command
    */
@@ -75,7 +75,7 @@ static EnvironmentBuilder builder() {
   /**
    * Return whether a stream exists or not.
    *
-   * @param stream
+   * @param stream the stream to check the existence
    * @return true if stream exists, false if it does not exist
    * @throws StreamException if response code is different from {@link Constants#RESPONSE_CODE_OK}
    *     or {@link Constants#RESPONSE_CODE_STREAM_DOES_NOT_EXIST}

src/main/java/com/rabbitmq/stream/impl/StreamEnvironment.java

@@ -216,8 +216,10 @@ class StreamEnvironment implements Environment {
               lastException = e;
             }
           }
-          if (this.locators.stream().allMatch(l -> l.isNotSet())) {
-            throw lastException;
+          if (this.locators.stream().allMatch(Locator::isNotSet)) {
+            throw lastException == null
+                ? new StreamException("Not locator available")
+                : lastException;
           } else {
             this.locators.forEach(
                 l -> {