JS: fix FE crashing when type argument count less than parameter count

See KT-20908

compiler/testData/diagnostics/testsWithJsStdLib/module/incompleteReifiedArg.kt

@@ -0,0 +1,5 @@
+inline fun <T, reified K> bar() {}
+
+fun foo() {
+    bar<!WRONG_NUMBER_OF_TYPE_ARGUMENTS!><Int><!>()
+}

compiler/testData/diagnostics/testsWithJsStdLib/module/incompleteReifiedArg.txt

@@ -0,0 +1,4 @@
+package
+
+public inline fun </*0*/ T, /*1*/ reified K> bar(): kotlin.Unit
+public fun foo(): kotlin.Unit

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestWithJsStdLibGenerated.java

@@ -434,6 +434,12 @@ public class DiagnosticsTestWithJsStdLibGenerated extends AbstractDiagnosticsTes
             doTest(fileName);
         }
 
+        @TestMetadata("incompleteReifiedArg.kt")
+        public void testIncompleteReifiedArg() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/testsWithJsStdLib/module/incompleteReifiedArg.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("jsModuleNonExternal.kt")
         public void testJsModuleNonExternal() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/testsWithJsStdLib/module/jsModuleNonExternal.kt");

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/JsModuleCallChecker.kt

@@ -49,7 +49,9 @@ object JsModuleCallChecker : CallChecker {
         val containingDescriptor = context.scope.ownerDescriptor
         val typeParams = call.candidateDescriptor.typeParameters.map { it.original }.withIndex().filter { (_, param) -> param.isReified }
         val typeArguments = call.call.typeArgumentList
-                ?.let { args -> typeParams.associate { (index, param) -> param.original to args.arguments[index].typeReference }}
+                ?.let { args ->
+                    typeParams.associate { (index, param) -> param.original to args.arguments.getOrNull(index)?.typeReference }
+                }
                 .orEmpty()
         for (typeParam in typeParams.map { (_, param) -> param.original }) {
             val argPsi = typeArguments[typeParam] ?: reportOn