Example failure of jsx completion when the component is declared external.

See #307

Author: cristianoc

analysis/tests/src/Jsx.res

@@ -42,4 +42,13 @@ let y = 44
 //^com <M prop=%bs.raw("1") k
 
 let _ = <Component />
-//         ^def
+//         ^def 
+
+module Ext = {
+  @react.component @module("@material-ui/core")
+  external make: (~align: string=?) => React.element = "Typography"
+}
+
+let extMake = Ext.make
+
+//^com <Ext al

analysis/tests/src/expected/Jsx.res.txt

@@ -181,3 +181,6 @@ Complete tests/src/Jsx.res 40:2
 Definition tests/src/Jsx.res 43:11
 {"uri": "Component.res", "range": {"start": {"line": 1, "character": 4}, "end": {"line": 1, "character": 8}}}
 
+Complete tests/src/Jsx.res 52:2
+[]
+