fix M3U parsing bug, adjust unit tests

src/main/java/com/mykola2312/mptv/config/SourceItem.java

@@ -25,6 +25,6 @@ public class SourceItem {
     @Nullable
     public String cookies;
 
-    @Nullable
+    @NonNull
     public String rootCategory;
 }

src/main/java/com/mykola2312/mptv/parser/M3UParser.java

@@ -50,6 +50,12 @@ public class M3UParser {
                     }
 
                     case URL_LINE -> {
+                        /* there may by other tags like #EXTVLCOPT that may get in the way 
+                            so for now we're just skipping them until we hit url.
+                            in future, if needed, we can extract user-agent from EXTVLCOPT */ 
+                        if (line.startsWith("#")) {
+                            continue;
+                        }
                         String url = line;
                         
                         item.url = url;

src/test/java/com/mykola2312/mptv/TestConfig.java

@@ -33,12 +33,12 @@ public class TestConfig {
                 "type": "m3u",
                 "url": "https://example.com/list.m3u",
                 "cookies": null,
-                "singleCategory": null
+                "rootCategory": "m3u"
               },
               {
                 "type": "m3u-local",
                 "path": "test.m3u8",
-                "singleCategory": "test"
+                "rootCategory": "m3u-local"
               }
             ]
           }
@@ -81,14 +81,14 @@ public class TestConfig {
         SourceItem m3u = config.sources.get(0);
         assertEquals(SourceItem.SourceType.M3U, m3u.type);
         assertEquals("https://example.com/list.m3u", m3u.url);
+        assertEquals("m3u", m3u.rootCategory);
         assertNull(m3u.path);
         assertNull(m3u.cookies);
-        assertNull(m3u.rootCategory);
 
         SourceItem m3uLocal = config.sources.get(1);
         assertEquals(SourceItem.SourceType.M3U_LOCAL, m3uLocal.type);
         assertEquals("test.m3u8", m3uLocal.path);
-        assertEquals("test", m3uLocal.rootCategory);
+        assertEquals("m3u-local", m3uLocal.rootCategory);
         assertNull(m3uLocal.url);
         assertNull(m3uLocal.cookies);
     }

src/test/java/com/mykola2312/mptv/TestM3U.java

@@ -18,6 +18,9 @@ http://example.org/video1.m3u8
 
 #EXTINF:-1 group-title="test2" ,Test title 2
 http://example.org/video2.m3u8
+#EXTINF:-1 group-title="test3",Test title 3
+#EXTVLCOPT:http-user-agent=User-Agent/1.0
+http://example.org/video3.m3u8
             """;
 
     @Test
@@ -36,6 +39,12 @@ http://example.org/video2.m3u8
         assertEquals("test2", item.groupTitle);
         assertEquals("http://example.org/video2.m3u8", item.url);
         assertNull(item.tvgLogo);
+
+        item = items.get(2);
+        assertEquals("Test title 3", item.title);
+        assertEquals("test3", item.groupTitle);
+        assertEquals("http://example.org/video3.m3u8", item.url);
+        assertNull(item.tvgLogo);
     }
 
     @Test