Add optional string command execution

core/src/main/java/io/xpipe/core/process/CommandControl.java

@@ -7,6 +7,7 @@ import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.nio.charset.Charset;
+import java.util.Optional;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
@@ -90,6 +91,8 @@ public interface CommandControl extends ProcessControl {
 
     String readStdoutAndWait() throws Exception;
 
+    Optional<String> readStdoutIfPossible() throws Exception;
+
     default boolean discardAndCheckExit() throws ProcessOutputException {
         try {
             discardOrThrow();