strict null checks azure (#11928)

* strict null checks azure

* strict compilation

* Fix compilation issues

* Return empty arrays instead

src/sql/azdata.d.ts

@@ -297,10 +297,10 @@ declare module 'azdata' {
 		nodePath: string;
 		nodeType: string;
 		nodeSubType: string;
-		nodeStatus: string;
+		nodeStatus?: string;
 		label: string;
 		isLeaf: boolean;
-		metadata: ObjectMetadata;
+		metadata?: ObjectMetadata;
 		errorMessage: string;
 		/**
 		 * Optional iconType for the object in the tree. Currently this only supports
@@ -320,7 +320,7 @@ declare module 'azdata' {
 	}
 
 	export interface IConnectionProfile extends ConnectionInfo {
-		connectionName: string;
+		connectionName?: string;
 		serverName: string;
 		databaseName: string;
 		userName: string;
@@ -427,11 +427,11 @@ declare module 'azdata' {
 		/**
 		 * The major version of the instance.
 		 */
-		serverMajorVersion: number;
+		serverMajorVersion?: number;
 		/**
 		 * The minor version of the instance.
 		 */
-		serverMinorVersion: number;
+		serverMinorVersion?: number;
 		/**
 		 * The build of the instance.
 		 */
@@ -1231,7 +1231,7 @@ declare module 'azdata' {
 		sessionId: string;
 		nodePath: string;
 		nodes: NodeInfo[];
-		errorMessage: string;
+		errorMessage?: string;
 	}
 
 	export interface ExpandNodeInfo {
@@ -1249,7 +1249,7 @@ declare module 'azdata' {
 	}
 
 	export interface ObjectExplorerCloseSessionInfo {
-		sessionId: string;
+		sessionId?: string;
 	}
 
 	export interface ObjectExplorerCloseSessionResponse {
@@ -4130,7 +4130,7 @@ declare module 'azdata' {
 		 * Note that the connection is not guaranteed to be in a connected
 		 * state on click.
 		 */
-		connectionProfile: IConnectionProfile;
+		connectionProfile?: IConnectionProfile;
 	}
 
 	/**
@@ -4149,7 +4149,7 @@ declare module 'azdata' {
 		 * Node info for objects below a specific connection. This
 		 * may be null for a Connection-level object
 		 */
-		nodeInfo: NodeInfo;
+		nodeInfo?: NodeInfo;
 	}
 
 	/**