Don't crash when evaluating a non-existing script

Author: rubensworks

src/main/java/org/cyclops/integratedscripting/core/network/GraalScriptFactory.java

@@ -46,7 +46,13 @@ public IScript getScript(int disk, Path path) throws EvaluationException {
 
         try {
             // Read script
-            Source source = Source.newBuilder(this.languageId, ScriptingNetworkHelpers.getScriptingData().getScripts(disk).get(path), path.toString()).build();
+            String contents = ScriptingNetworkHelpers.getScriptingData().getScripts(disk).get(path);
+            if (contents == null) {
+                throw EvaluationExceptionResolutionHelpers.resolveOnScriptChange(
+                        new EvaluationException(Component.translatable("script.integratedscripting.error.script_missing", path.toString(), disk)),
+                        disk, path);
+            }
+            Source source = Source.newBuilder(this.languageId, contents, path.toString()).build();
             try {
                 graalContext.eval(source);
             } catch (PolyglotException e) {

src/main/resources/assets/integratedscripting/lang/en_us.json

@@ -57,6 +57,7 @@
   "script.integratedscripting.error.path_not_in_network": "Disk with id %s does not contain the script \"%s\".",
   "script.integratedscripting.error.member_not_in_network": "Disk with id %s does not contain the member \"%s\" in the script \"%s\".",
   "script.integratedscripting.error.unsupported_language": "The language of script \"%s\" is not supported.",
+  "script.integratedscripting.error.script_missing": "The script \"%s\" at disk %s does not exist",
   "script.integratedscripting.error.script_read": "An error occurred when reading the script \"%s\" at disk %s: %s",
   "script.integratedscripting.error.script_exec": "An error occurred when executing the member \"%s\" in script \"%s\" at disk %s: %s",
   "script.integratedscripting.error.invalid_type": "Script with member \"%s\" in script \"%s\" at disk %s is expected to expose a variable with type %s while %s is found.",