Use valid values for terminal font config

Fixes #7420

src/vs/workbench/parts/terminal/electron-browser/terminal.contribution.ts

@@ -68,11 +68,13 @@ configurationRegistry.registerConfiguration({
 		},
 		'terminal.integrated.fontSize': {
 			'description': nls.localize('terminal.integrated.fontSize', "Controls the font size of the terminal, this defaults to editor.fontSize's value."),
-			'type': 'number'
+			'type': 'number',
+			'default': 0
 		},
 		'terminal.integrated.lineHeight': {
 			'description': nls.localize('terminal.integrated.lineHeight', "Controls the line height of the terminal, this defaults to editor.lineHeight's value."),
-			'type': 'number'
+			'type': 'number',
+			'default': 0
 		}
 	}
 });

src/vs/workbench/parts/terminal/test/terminalConfigHelper.test.ts

@@ -62,7 +62,7 @@ suite('Workbench - TerminalConfigHelper', () => {
 			},
 			terminal: {
 				integrated: {
-					fontFamily: undefined
+					fontFamily: 0
 				}
 			}
 		});
@@ -91,8 +91,8 @@ suite('Workbench - TerminalConfigHelper', () => {
 			},
 			terminal: {
 				integrated: {
-					fontFamily: undefined,
-					fontSize: undefined
+					fontFamily: 0,
+					fontSize: 0
 				}
 			}
 		});
@@ -106,7 +106,7 @@ suite('Workbench - TerminalConfigHelper', () => {
 			},
 			terminal: {
 				integrated: {
-					fontFamily: undefined,
+					fontFamily: 0,
 					lineHeight: 2
 				}
 			}
@@ -121,8 +121,8 @@ suite('Workbench - TerminalConfigHelper', () => {
 			},
 			terminal: {
 				integrated: {
-					fontFamily: undefined,
-					lineHeight: undefined
+					fontFamily: 0,
+					lineHeight: 0
 				}
 			}
 		});