Add check to see if assets are bundled in API.

Author: Jacek Gębal

src/main/java/org/utplsql/cli/reporters/LocalAssetsCoverageHTMLReporter.java

@@ -29,13 +29,17 @@ public LocalAssetsCoverageHTMLReporter(String selfType, Object[] attributes) {
     public Reporter init(Connection con, CompatibilityProxy compatibilityProxy, ReporterFactory reporterFactory) throws SQLException {
         super.init(con, compatibilityProxy, reporterFactory);
 
-        if (hasOutputToFile()) {
+        if (hasOutputToFile() && assetsAreBundled()) {
             writeReportAssetsTo(getPhysicalAssetPath());
         }
 
         return this;
     }
 
+    private static boolean assetsAreBundled() {
+        return CoverageHTMLReporter.class.getResource("/CoverageHTMLReporter") != null;
+    }
+
     private String getNameOfOutputFile() {
         Path outputPath = Paths.get(options.getOutputFileName());
         return outputPath.getName(outputPath.getNameCount() - 1).toString();
@@ -51,7 +55,7 @@ private Path getPhysicalAssetPath() {
     }
 
     private void setAssetsPathFromOptions() {
-        if (hasOutputToFile()) {
+        if (hasOutputToFile() && assetsAreBundled()) {
             setAssetsPath(getNameOfOutputFile() + "_assets/");
         }
     }