use lodash isUndefined function
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		@@ -1,5 +1,6 @@
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import * as React from 'react';
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import styled from 'styled-components';
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import * as _ from 'lodash';
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import { colors } from 'ts/variables';
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@@ -49,10 +50,10 @@ const Base =
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    CodeProps >
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    `
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    font-size: .875rem;
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    color: ${props => (props.language === undefined ? colors.white : 'inherit')};
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    color: ${props => (_.isUndefined(props.language) ? colors.white : 'inherit')};
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    background-color: ${props =>
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        props.isLight ? 'rgba(255,255,255,.15)' : props.language === undefined ? colors.black : '#F1F4F5'};
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    white-space: ${props => (props.language === undefined ? 'nowrap' : '')};
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        props.isLight ? 'rgba(255,255,255,.15)' : _.isUndefined(props.language) ? colors.black : '#F1F4F5'};
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    white-space: ${props => (_.isUndefined(props.language) ? 'nowrap' : '')};
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    position: relative;
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    ${props =>
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@@ -149,7 +150,7 @@ class Code extends React.Component<CodeProps, CodeState> {
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            <Container>
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                <Base language={language} isDiff={isDiff} isLight={isLight}>
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                    <StyledPre isDiff={isDiff}>
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                        {hlCode === undefined ? (
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                        {_.isUndefined(hlCode) ? (
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                            <code>{children}</code>
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                        ) : (
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                            <StyledCodeDiff
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@@ -1,5 +1,6 @@
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import * as React from 'react';
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import styled from 'styled-components';
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import * as _ from 'lodash';
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import { ContextInterface } from 'ts/context';
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import { media } from 'ts/variables';
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@@ -69,7 +70,7 @@ const ContentBlock: React.StatelessComponent<ContentBlockProps> = props => {
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    return (
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        <Base>
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            <Title color={props.colors}>{props.title}</Title>
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            {children === undefined ? null : <Content>{children}</Content>}
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            {_.isUndefined(children) ? null : <Content>{children}</Content>}
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        </Base>
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    );
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};
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