use FINE for the "No Output" message

src/de/uni_passau/fim/seibt/gitwrapper/process/ProcessExecutor.java

@@ -92,13 +92,13 @@ public class ProcessExecutor {
             LOG.fine(() -> String.format("Execution of '%s' returned exit code %d.", cmd, res.exitCode));
 
             if (res.stdOut.isEmpty()) {
-                LOG.finest(() -> String.format("Execution of '%s' returned no standard output.", cmd));
+                LOG.fine(() -> String.format("Execution of '%s' returned no standard output.", cmd));
             } else {
                 LOG.finest(() -> String.format("Execution of '%s' returned standard output:%n%s", cmd, res.stdOut));
             }
 
             if (res.stdErr.isEmpty()) {
-                LOG.finest(() -> String.format("Execution of '%s' returned no standard error output.", cmd));
+                LOG.fine(() -> String.format("Execution of '%s' returned no standard error output.", cmd));
             } else {
                 LOG.finest(() -> String.format("Execution of '%s' returned standard error output:%n%s", cmd, res.stdErr));
             }