Fixed npmName/Version condition check so it doesn't throw error unnecessarily

Author: szymonbultrowicz

typescript-generator-gradle-plugin/src/main/java/cz/habarta/typescript/generator/gradle/GenerateTask.java

@@ -144,8 +144,8 @@ public void generate() throws Exception {
         settings.loadIncludePropertyAnnotations(classLoader, includePropertyAnnotations);
         settings.loadOptionalAnnotations(classLoader, optionalAnnotations);
         settings.generateNpmPackageJson = generateNpmPackageJson;
-        settings.npmName = npmName != null ? npmName : getProject().getName();
-        settings.npmVersion = npmVersion != null ? npmVersion : settings.getDefaultNpmVersion();
+        settings.npmName = npmName == null && generateNpmPackageJson ? getProject().getName() : npmName;
+        settings.npmVersion = npmVersion == null && generateNpmPackageJson ? settings.getDefaultNpmVersion() : npmVersion;
         settings.setStringQuotes(stringQuotes);
         settings.setIndentString(indentString);
         settings.displaySerializerWarning = displaySerializerWarning;