fix: handle scenarios in which `dt` is not defined

Signed-off-by: Pranav C <pranavxc@gmail.com>

packages/nocodb-sdk/src/lib/sqlUi/MssqlUi.ts

@@ -832,7 +832,7 @@ export class MssqlUi {
   }
 
   static getAbstractType(col): any {
-    switch ((col.dt || col.dt).toLowerCase()) {
+    switch (col.dt?.toLowerCase()) {
       case 'bigint':
       case 'smallint':
       case 'bit':

packages/nocodb-sdk/src/lib/sqlUi/MysqlUi.ts

@@ -871,7 +871,7 @@ export class MysqlUi {
   }
 
   static getAbstractType(col): any {
-    switch (col.dt.toLowerCase()) {
+    switch (col.dt?.toLowerCase()) {
       case 'int':
       case 'smallint':
       case 'mediumint':

packages/nocodb-sdk/src/lib/sqlUi/OracleUi.ts

@@ -689,7 +689,7 @@ export class OracleUi {
   }
 
   static getAbstractType(col): any {
-    switch ((col.dt || col.dt).toLowerCase()) {
+    switch (col.dt?.toLowerCase()) {
       case 'integer':
         return 'integer';
       case 'bfile':

packages/nocodb-sdk/src/lib/sqlUi/PgUi.ts

@@ -1358,7 +1358,7 @@ export class PgUi {
   }
 
   static getAbstractType(col): any {
-    switch ((col.dt || col.dt).toLowerCase()) {
+    switch (col.dt?.toLowerCase()) {
       case 'anyenum':
         return 'enum';
       case 'anynonarray':

packages/nocodb-sdk/src/lib/sqlUi/SnowflakeUi.ts

@@ -572,7 +572,7 @@ export class SnowflakeUi {
   }
 
   static getAbstractType(col): any {
-    switch (col.dt.toUpperCase()) {
+    switch (col.dt?.toUpperCase()) {
       case 'NUMBER':
       case 'DECIMAL':
       case 'NUMERIC':