fix npe on missing javadoc description (via #427)

Author: aski

allure-descriptions-javadoc/src/main/java/io/qameta/allure/description/JavaDocDescriptionsProcessor.java

@@ -71,6 +71,12 @@ public boolean process(final Set<? extends TypeElement> annotations, final Round
             final List<String> typeParams = ((ExecutableElement) el).getParameters().stream()
                     .map(param -> param.asType().toString()).collect(Collectors.toList());
             final String name = el.getSimpleName().toString();
+            if (docs == null) {
+                messager.printMessage(Diagnostic.Kind.WARNING,
+                        "Unable to create resource for method " + name + typeParams
+                                + " as it does not have a docs comment");
+                return;
+            }
 
             final String hash = generateMethodSignatureHash(el.getEnclosingElement().toString(), name, typeParams);
             try {

allure-descriptions-javadoc/src/test/java/io/qameta/allure/description/ProcessDescriptionsTest.java

@@ -61,4 +61,27 @@ void captureDescriptionTest() {
                 expectedMethodSignatureHash
         );
     }
+
+    @Test
+    void skipUncommentedMethodTest() {
+        JavaFileObject source = JavaFileObjects.forSourceLines(
+                "io.qameta.allure.description.test.DescriptionSample",
+                "package io.qameta.allure.description.test;",
+                "import io.qameta.allure.Description;",
+                "",
+                "public class DescriptionSample {",
+                "",
+                "@Description(useJavaDoc = true)",
+                "public void sampleTestWithoutJavadocComment() {",
+                "}",
+                "}"
+        );
+
+        Compiler compiler = javac().withProcessors(new JavaDocDescriptionsProcessor());
+        Compilation compilation = compiler.compile(source);
+        assertThat(compilation).succeeded();
+        assertThat(compilation)
+                .hadWarningContaining("Unable to create resource for method "
+                        + "sampleTestWithoutJavadocComment[] as it does not have a docs comment");
+    }
 }