Filter out uninitialized variable error for assignment targets

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/expressioneditor/services/LvExpressionDiagnosticRequest.java

@@ -49,6 +49,8 @@ public class LvExpressionDiagnosticRequest extends DiagnosticsRequest {
     private static final DiagnosticErrorCode INVALID_EXPRESSION_CODE = DiagnosticErrorCode.INVALID_EXPR_STATEMENT;
     private static final DiagnosticErrorCode UNDERSCORE_NOT_ALLOWED_CODE =
             DiagnosticErrorCode.UNDERSCORE_NOT_ALLOWED_AS_IDENTIFIER;
+    private static final DiagnosticErrorCode VARIABLE_NOT_INITIALIZED_CODE =
+            DiagnosticErrorCode.USAGE_OF_UNINITIALIZED_VARIABLE;
 
     public LvExpressionDiagnosticRequest(ExpressionEditorContext context) {
         super(context);
@@ -109,8 +111,14 @@ protected Set<Diagnostic> getSemanticDiagnostics(ExpressionEditorContext context
                 context.workspaceManager().semanticModel(context.filePath());
         return semanticModel.map(model -> model.diagnostics(lineRange).stream()
                 .filter(diagnostic -> diagnostic.diagnosticInfo().severity() == DiagnosticSeverity.ERROR
-                        && !UNDERSCORE_NOT_ALLOWED_CODE.diagnosticId().equals(diagnostic.diagnosticInfo().code()))
+                        && isRelevantDiagnostic(diagnostic))
                 .map(CommonUtils::transformBallerinaDiagnostic)
                 .collect(Collectors.toSet())).orElseGet(Set::of);
     }
+
+    private boolean isRelevantDiagnostic(io.ballerina.tools.diagnostics.Diagnostic diagnostic) {
+        String code = diagnostic.diagnosticInfo().code();
+        return !UNDERSCORE_NOT_ALLOWED_CODE.diagnosticId().equals(code)
+                && !VARIABLE_NOT_INITIALIZED_CODE.diagnosticId().equals(code);
+    }
 }

flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/diagnostics/config/variable9.json

@@ -0,0 +1,37 @@
+{
+  "description": "Uninitialized variable",
+  "filePath": "empty.bal",
+  "context": {
+    "expression": "var1",
+    "startLine": {
+      "line": 4,
+      "offset": 22
+    },
+    "offset": 0,
+    "lineOffset": 0,
+    "codedata": {
+      "node": "ASSIGN",
+      "isNew": true
+    },
+    "property": {
+      "metadata": {
+        "label": "Variable",
+        "description": "Name of the variable/field"
+      },
+      "optional": false,
+      "editable": true,
+      "advanced": false,
+      "types": [
+        {
+          "fieldType": "LV_EXPRESSION",
+          "selected": false
+        }
+      ],
+      "diagnostics": {
+        "hasDiagnostics": false,
+        "diagnostics": []
+      }
+    }
+  },
+  "diagnostics": []
+}

flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/diagnostics/source/empty.bal

@@ -0,0 +1,10 @@
+import ballerina/log;
+
+public function main() returns error? {
+    do {
+        string[] var1;
+    } on fail error e {
+        log:printError("Error occurred", 'error = e);
+        return e;
+    }
+}