fix crash on invalid rtmp url

Author: pedroSG94

common/src/main/java/com/pedro/common/UrlParser.kt

@@ -71,6 +71,7 @@ class UrlParser private constructor(
     val path = getFullPath().ifEmpty { query ?: "" }.replace(queries, "")
     val segments = path.split('/').filter { it.isNotEmpty() }
     return when(segments.size) {
+      0 -> ""
       1, 2 -> segments[0]
       else -> segments.subList(0, 2).joinToString("/")
     }

common/src/test/java/com/pedro/common/UrlParserTest.kt

@@ -9,6 +9,16 @@ import java.net.URISyntaxException
  */
 class UrlParserTest {
 
+  @Test
+  fun testNoAppName() {
+    val url = "rtmp://localhost:1935/"
+    val urlParser = UrlParser.parse(url, arrayOf("rtmp"))
+    assertEquals("rtmp", urlParser.scheme)
+    assertEquals("localhost", urlParser.host)
+    assertEquals(1935, urlParser.port)
+    assertEquals("", urlParser.getAppName())
+  }
+
   @Test
   fun testRtmpUrls() {
     try {