Verify that an if condition block returns a value

src/test/ui/issue-13483.rs

@@ -10,7 +10,16 @@
 
 fn main() {
     if true {
-    } else if { //ERROR: MISSING CONDITIONAL
+    } else if {
     } else {
-    };
+    }
 }
+
+fn foo() {
+    if true {
+    } else if {
+    }
+    bar();
+}
+
+fn bar() {}

src/test/ui/issue-13483.stderr

@@ -1,8 +1,14 @@
 error: missing condition for `if` statemement
   --> $DIR/issue-13483.rs:13:14
    |
-13 |     } else if { //ERROR: MISSING CONDITIONAL
+13 |     } else if {
    |              ^ expected if condition here
 
-error: aborting due to previous error
+error: missing condition for `if` statemement
+  --> $DIR/issue-13483.rs:20:14
+   |
+20 |     } else if {
+   |              ^ expected if condition here
+
+error: aborting due to 2 previous errors