Fix for self-referential imports in typescript-angular client (#6450)

Author: Bols

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/TypeScriptAngularClientCodegen.java

@@ -270,19 +270,21 @@ public Map<String, Object> postProcessModels(Map<String, Object> objs) {
         for (Object _mo : models) {
             Map<String, Object> mo = (Map<String, Object>) _mo;
             CodegenModel cm = (CodegenModel) mo.get("model");
-            mo.put("tsImports", toTsImports(cm.imports));
+            mo.put("tsImports", toTsImports(cm,cm.imports));
         }
 
         return result;
     }
 
-    private List<Map<String, String>> toTsImports(Set<String> imports) {
+    private List<Map<String, String>> toTsImports(CodegenModel cm, Set<String> imports) {
             List<Map<String, String>> tsImports = new ArrayList<>();
             for(String im : imports) {
+                if(!im.equals(cm.classname)) {
                     HashMap<String, String> tsImport = new HashMap<>();
                     tsImport.put("classname", im);
                     tsImport.put("filename", toModelFilename(im));
                     tsImports.add(tsImport);
+                }
             }
             return tsImports;
     }