[GR-47694] Accept empty java.vendor.version property in fallback version printer

PullRequest: graal/15149

Author: lewurm

espresso/src/com.oracle.truffle.espresso.launcher/src/com/oracle/truffle/espresso/launcher/EspressoLauncher.java

@@ -622,7 +622,7 @@ private void printVersionFallback(Context context) {
         String javaVersion = system.invokeMember("getProperty", "java.version").asString();
         String javaVersionDate = system.invokeMember("getProperty", "java.version.date").asString();
         String debugLevel = system.invokeMember("getProperty", "jdk.debug", "release").asString();
-        String vendorVersion = system.invokeMember("getProperty", "java.vendor.version").asString();
+        String vendorVersion = system.invokeMember("getProperty", "java.vendor.version", "").asString();
         String javaRuntimeName = system.invokeMember("getProperty", "java.runtime.name").asString();
         String javaRuntimeVersion = system.invokeMember("getProperty", "java.runtime.version").asString();
         boolean isLTS = javaRuntimeVersion.contains("LTS");