fix regression after gpr2 exceptions fixed on windows

gpr-issues#259

Author: Philippe Gil

testsuite/gpr_lsp/import_using_space_string/windows/test.json

@@ -109,15 +109,15 @@
                 "range": {
                   "start": {
                     "line": 0,
-                    "character": 0
+                    "character": 5
                   },
                   "end": {
                     "line": 0,
-                    "character": 0
+                    "character": 5
                   }
                 },
                 "severity": 1,
-                "message": "GPR parser unexpected ADA.IO_EXCEPTIONS.NAME_ERROR invalid path name \" \""
+                "message": "imported project file \" .gpr\" not found"
               }
             ]
           }

testsuite/gpr_lsp/invalid_file_name_support/windows/test.json

@@ -109,17 +109,32 @@
                 "range": {
                   "start": {
                     "line": 0,
-                    "character": 0
+                    "character": 5
                   },
                   "end": {
                     "line": 0,
-                    "character": 0
+                    "character": 5
                   }
                 },
                 "severity": 1,
-               
-                "message": "GPR parser unexpected ADA.IO_EXCEPTIONS.NAME_ERROR invalid path name \"  \""
-              }      
+                "source": "project",
+                "message": "imported project file \"  .gpr\" not found"
+              },
+              {
+                "range": {
+                  "start": {
+                    "line": 1,
+                    "character": 22
+                  },
+                  "end": {
+                    "line": 1,
+                    "character": 22
+                  }
+                },
+                "severity": 1,
+                "source": "project",
+                "message": "extended project file \"  .gpr\" not found"
+              }
             ]
           }
         }