#1874 added placeholder for refund source

Author: clairehendershot5

src/frontend/src/pages/FinancePage/ReimbursementRequestForm/ReimbursementFormView.tsx

@@ -253,6 +253,14 @@ const ReimbursementRequestFormView: React.FC<ReimbursementRequestFormViewProps>
                     value={value}
                     disabled={!selectedExpenseType}
                     error={!!errors.account}
+                    displayEmpty
+                    renderValue={() => {
+                      return value ? (
+                        <Typography>{codeAndRefundSourceName(value)} </Typography>
+                      ) : (
+                        <Typography style={{ color: 'gray' }}>Select Refund Source</Typography>
+                      );
+                    }}
                   >
                     {refundSources.map((refundSource) => (
                       <MenuItem key={refundSource} value={refundSource}>