fix when parentModule not found

Author: bung87

compiler/modules/modulegraphs.nim

@@ -599,7 +599,7 @@ proc parentModule*(g: ModuleGraph; fileIdx: FileIndex): FileIndex =
   if fileIdx.int32 >= 0 and fileIdx.int32 < g.ifaces.len and g.ifaces[fileIdx.int32].module != nil:
     result = fileIdx
   else:
-    result = g.inclToMod.getOrDefault(fileIdx)
+    result = g.inclToMod.getOrDefault(fileIdx, InvalidFileIdx)
 
 proc markDirty*(g: ModuleGraph; fileIdx: FileIndex) =
   let m = g.getModule fileIdx

compiler/tools/suggest.nim

@@ -492,7 +492,9 @@ proc executeCmd*(cmd: IdeCmd, file, dirtyfile: AbsoluteFile, line, col: int;
       dirtyfile.isEmpty:
     discard "no need to recompile anything"
   else:
-    let modIdx = graph.parentModule(dirtyIdx)
+    var modIdx = graph.parentModule(dirtyIdx)
+    if modIdx == InvalidFileIdx:
+      modIdx = dirtyIdx
     graph.markDirty dirtyIdx
     graph.markClientsDirty dirtyIdx
     # partially recompiling the project means that that VM and JIT state